Add reference material for the style of markdown we use.

Preview here: http://skiadocs.com:8000/dev/tools/markdown?cl=853493004

Note that the image won't show up, that's a known issue with the way patching in CLs works.

BUG=skia:

Review URL: https://codereview.chromium.org/853493004

2 files changed, 366 insertions, 0 deletions

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+Markdown
+========
+
+This site can handle normal MarkDown and many common extensions. To learn
+how the following is done please see the [source for this page](./docserver.md).
+Any file you put under `/site/` that has the extension `.md` will be processed
+as MarkDown. All other files will be served directly. For example, images
+can be added and they will be served correctly and referenced from within MarkDown files.
+
+Some Example MarkDown
+---------------------
+
+This is a [link](https://www.google.com). You can also create
+ordered and unordered lists:
+
+1. First
+2. Second:
+  * Fee
+    * Fie
+      * Foe
+  * Fum
+3. Third
+
+Incorporate images:
+
+![image](image.png)
+
+Or go old school and use [ASCII art](http://asciiflow.com/):
+
+~~~~
+
+       +----------------+
+       |  Should you    |
+    +--+ use ASCII art? +--+
+    |  +----------------+  |
+    |                      |
++---v---+              +---v---+
+|       |              |       |
+|  Yes  |              |  No   |
+|       |              |       |
++-------+              +-------+
+
+~~~~
+
+Format code snippets or other preformatted text.
+
+~~~~
+class SK_API SkPaint {
+public:
+    SkPaint();
+    SkPaint(const SkPaint& paint);
+    ~SkPaint();
+
+    SkPaint& operator=(const SkPaint&);
+~~~~
+
+Tables
+
+  Name    | Value    | Summary
+  --------|----------|--------
+  A       | 27       |  yes
+  B       | 23       |  no
+
+
+There are also inline styles for *emphasis*, **bold**,
+~~strikethrough~~, and `inline code`. Also small fractions,
+such as 1/2 are rendered nicely.
+
+> # There are
+> ## Headers
+> ### Up To
+> #### Six
+> ##### Levels
+> ###### Deep
+
+And you can <b>always</b> use HTML, which is useful for features that can't be
+done in MarkDown, such as iframes, but try to avoid using HTML outside of
+sitations like that.
+<svg viewBox="0 0 24 24" height="24px" width="24px" style="display: inline;">
+  <g>
+    <path d="M1
+    21h4v-12h-4v12zm22-11c0-1.1-.9-2-2-2h-6.31l.95-4.57.03-.32c0-.41-.17-.79-.44-1.06l-1.06-1.05-6.58
+    6.59c-.37.36-.59.86-.59 1.41v10c0 1.1.9 2 2 2h9c.83 0 1.54-.5
+    1.84-1.22l3.02-7.05c.09-.23.14-.47.14-.73v-1.91l-.01-.01.01-.08z"> </path>
+  </g>
+</svg>
+
+Reference
+=========
+
+Below is a longer reference on the MarkDown that docserver accepts.
+
+Paragraphs
+----------
+
+A paragraph is simply one or more consecutive lines of text, separated
+by one or more blank lines. (A blank line is any line that looks like a
+blank line -- a line containing nothing spaces or tabs is considered
+blank.) Normal paragraphs should not be intended with spaces or tabs.
+
+Headers and Blockquotes
+-----------------------
+
+You can create headers by either "underlining" with equal signs (`=`) and hyphens (`-`),
+or,you can put 1-6 hash marks (`#`) at the
+beginning of the line -- the number of hashes equals the resulting
+HTML header level.
+
+Blockquotes are indicated using email-style '`>`' angle brackets.
+
+Markdown:
+
+    A First Level Header
+    ====================
+    
+    A Second Level Header
+    ---------------------
+
+    Now is the time for all good men to come to
+    the aid of their country. This is just a
+    regular paragraph.
+
+    The quick brown fox jumped over the lazy
+    dog's back.
+    
+    ### Header 3
+
+    > This is a blockquote.
+    > 
+    > This is the second paragraph in the blockquote.
+    >
+    > ## This is an H2 in a blockquote
+
+
+Output:
+
+    <h1>A First Level Header</h1>
+    
+    <h2>A Second Level Header</h2>
+    
+    <p>Now is the time for all good men to come to
+    the aid of their country. This is just a
+    regular paragraph.</p>
+    
+    <p>The quick brown fox jumped over the lazy
+    dog's back.</p>
+    
+    <h3>Header 3</h3>
+    
+    <blockquote>
+        <p>This is a blockquote.</p>
+        
+        <p>This is the second paragraph in the blockquote.</p>
+        
+        <h2>This is an H2 in a blockquote</h2>
+    </blockquote>
+
+
+
+### Phrase Emphasis ###
+
+Markdown uses asterisks and underscores to indicate spans of emphasis.
+
+Markdown:
+
+    Some of these words *are emphasized*.
+    Some of these words _are emphasized also_.
+    
+    Use two asterisks for **strong emphasis**.
+    Or, if you prefer, __use two underscores instead__.
+
+Output:
+
+    <p>Some of these words <em>are emphasized</em>.
+    Some of these words <em>are emphasized also</em>.</p>
+    
+    <p>Use two asterisks for <strong>strong emphasis</strong>.
+    Or, if you prefer, <strong>use two underscores instead</strong>.</p>
+   
+
+
+## Lists ##
+
+Unordered (bulleted) lists use asterisks, pluses, and hyphens (`*`,
+`+`, and `-`) as list markers. These three markers are
+interchangable; this:
+
+    *   Candy.
+    *   Gum.
+    *   Booze.
+
+this:
+
+    +   Candy.
+    +   Gum.
+    +   Booze.
+
+and this:
+
+    -   Candy.
+    -   Gum.
+    -   Booze.
+
+all produce the same output:
+
+    <ul>
+    <li>Candy.</li>
+    <li>Gum.</li>
+    <li>Booze.</li>
+    </ul>
+
+Ordered (numbered) lists use regular numbers, followed by periods, as
+list markers:
+
+    1.  Red
+    2.  Green
+    3.  Blue
+
+Output:
+
+    <ol>
+    <li>Red</li>
+    <li>Green</li>
+    <li>Blue</li>
+    </ol>
+
+If you put blank lines between items, you'll get `<p>` tags for the
+list item text. You can create multi-paragraph list items by indenting
+the paragraphs by 4 spaces or 1 tab:
+
+    *   A list item.
+    
+        With multiple paragraphs.
+
+    *   Another item in the list.
+
+Output:
+
+    <ul>
+    <li><p>A list item.</p>
+    <p>With multiple paragraphs.</p></li>
+    <li><p>Another item in the list.</p></li>
+    </ul>
+    
+
+
+### Links ###
+
+Markdown supports two styles for creating links: *inline* and
+*reference*. With both styles, you use square brackets to delimit the
+text you want to turn into a link.
+
+Inline-style links use parentheses immediately after the link text.
+For example:
+
+    This is an [example link](http://example.com/).
+
+Output:
+
+    <p>This is an <a href="http://example.com/">
+    example link</a>.</p>
+
+Optionally, you may include a title attribute in the parentheses:
+
+    This is an [example link](http://example.com/ "With a Title").
+
+Output:
+
+    <p>This is an <a href="http://example.com/" title="With a Title">
+    example link</a>.</p>
+
+Reference-style links allow you to refer to your links by names, which
+you define elsewhere in your document:
+
+    I get 10 times more traffic from [Google][1] than from
+    [Yahoo][2] or [MSN][3].
+
+    [1]: http://google.com/        "Google"
+    [2]: http://search.yahoo.com/  "Yahoo Search"
+    [3]: http://search.msn.com/    "MSN Search"
+
+Output:
+
+    <p>I get 10 times more traffic from <a href="http://google.com/"
+    title="Google">Google</a> than from <a href="http://search.yahoo.com/"
+    title="Yahoo Search">Yahoo</a> or <a href="http://search.msn.com/"
+    title="MSN Search">MSN</a>.</p>
+
+The title attribute is optional. Link names may contain letters,
+numbers and spaces, but are *not* case sensitive:
+
+    I start my morning with a cup of coffee and
+    [The New York Times][NY Times].
+
+    [ny times]: http://www.nytimes.com/
+
+Output:
+
+    <p>I start my morning with a cup of coffee and
+    <a href="http://www.nytimes.com/">The New York Times</a>.</p>
+
+
+### Images ###
+
+Image syntax is very much like link syntax.
+
+Inline (titles are optional):
+
+    ![alt text](/path/to/img.jpg "Title")
+
+Reference-style:
+
+    ![alt text][id]
+
+    [id]: /path/to/img.jpg "Title"
+
+Both of the above examples produce the same output:
+
+    <img src="/path/to/img.jpg" alt="alt text" title="Title" />
+
+
+
+### Code ###
+
+In a regular paragraph, you can create code span by wrapping text in
+backtick quotes. Any ampersands (`&`) and angle brackets (`<` or
+`>`) will automatically be translated into HTML entities. This makes
+it easy to use Markdown to write about HTML example code:
+
+    I strongly recommend against using any `<blink>` tags.
+
+    I wish SmartyPants used named entities like `&mdash;`
+    instead of decimal-encoded entites like `&#8212;`.
+
+Output:
+
+    <p>I strongly recommend against using any
+    <code>&lt;blink&gt;</code> tags.</p>
+    
+    <p>I wish SmartyPants used named entities like
+    <code>&amp;mdash;</code> instead of decimal-encoded
+    entites like <code>&amp;#8212;</code>.</p>
+
+
+To specify an entire block of pre-formatted code, indent every line of
+the block by 4 spaces or 1 tab. Just like with code spans, `&`, `<`,
+and `>` characters will be escaped automatically.
+
+Markdown:
+
+    If you want your page to validate under XHTML 1.0 Strict,
+    you've got to put paragraph tags in your blockquotes:
+
+        <blockquote>
+            <p>For example.</p>
+        </blockquote>
+
+Output:
+
+    <p>If you want your page to validate under XHTML 1.0 Strict,
+    you've got to put paragraph tags in your blockquotes:</p>
+    
+    <pre><code>&lt;blockquote&gt;
+        &lt;p&gt;For example.&lt;/p&gt;
+    &lt;/blockquote&gt;
+    </code></pre>