Add documentation for umask

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+\section umask umask - Set or get the shells resurce usage limits
+
+\subsection umask-synopsis Synopsis
+<code>umask [OPTIONS] [MASK]</code>
+
+\subsection umask-description Description
+
+With no argument, the current file-creation mask is printed, if an
+argument is specified, it is the new file creation mask.
+
+- <code>-h</code> or <code>--help</code> print this message
+- <code>-S</code> or <code>--symbolic</code> prints the file-creation mask in symbolic form instead of octal form. Use <code>man chmod</code> for more information.
+- <code>-p</code> or <code>--as-command</code> prints any output in a form that may be reused as input
+
+The umask implementation in fish should behave identically to the one in bash.
+
+\subsection umask-example Example
+
+<code>umask 600</code> sets the file creation mask to read and write for the owner and no permissions at all for any other users.
+