Add information about sanitizer support to README.md.
BUG=aomedia:736
Change-Id: I628b809caf98215ff2082eca3926247da555f9d3
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suffixed with gcc behave differently than the others. These toolchain files
attempt to obey the $CROSS environment variable.
+### Sanitizers
+
+Sanitizer integration is built-in to the CMake build system. To enable a
+sanitizer, add `-DSANITIZE=<type>` to the CMake command line. For example, to
+enable address sanitizer:
+
+~~~
+ $ cmake path/to/aom -DSANITIZE=address
+ $ make
+~~~
+
+Sanitizers available vary by platform, target, and compiler. Consult your
+compiler documentation to determine which, if any, are available.
+
### Microsoft Visual Studio builds
Building the AV1 codec library in Microsoft Visual Studio is supported. The
