Create CONTRIBUTING.md file.

This supports Github's automatic special casing of CONTRIBUTING/CONTRIBUTING.md files to post a notice at the top of the project.

--
MOS_MIGRATED_REVID=89994097

1 files changed, 27 insertions, 0 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000000..5f2d96a467
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,27 @@
+Want to contribute? Great! First, read this page (including the small print at the end).
+
+### Before you contribute
+**Before we can use your code, you must sign the
+[Google Individual Contributor License Agreement](https://developers.google.com/open-source/cla/individual?csw=1)
+(CLA)**, which you can do online.
+
+The CLA is necessary mainly because you own the copyright to your changes,
+even after your contribution becomes part of our codebase, so we need your
+permission to use and distribute your code. We also need to be sure of
+various other things — for instance that you'll tell us if you know that
+your code infringes on other people's patents. You don't have to sign
+the CLA until after you've submitted your code for review and a member has
+approved it, but you must do it before we can put your code into our codebase.
+
+Before you start working on a larger contribution, you should get in touch
+with us first. Use the issue tracker to explain your idea so we can help and
+possibly guide you.
+
+### Code reviews and other contributions.
+**All submissions, including submissions by project members, require review.**
+Please follow the instructions in [the contributors documentation](http://bazel.io/docs/contributing.html).
+
+### The small print
+Contributions made by corporations are covered by a different agreement than
+the one above, the
+[Software Grant and Corporate Contributor License Agreement](https://developers.google.com/open-source/cla).