Improve documentation.

Change-Id: Iab20bde3fdf1fee5c6b47c748baae0266769e333
Reviewed-on: https://swiftshader-review.googlesource.com/5782
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/CONTRIBUTING.txt b/CONTRIBUTING.txt
index b717d67..2cedc8e 100644
--- a/CONTRIBUTING.txt
+++ b/CONTRIBUTING.txt
@@ -19,6 +19,8 @@
 ### Code reviews

 All submissions, including submissions by project members, require review.

 

+Information on how to sumbit changes for review is provided in README.md.

+

 ### The small print

 Contributions made by corporations are covered by a different agreement than

 the one above, the