Provide link to developer's policy

llvm-svn: 140857
diff --git a/libcxx/www/index.html b/libcxx/www/index.html
index 17bf016..fbdf123 100644
--- a/libcxx/www/index.html
+++ b/libcxx/www/index.html
@@ -134,6 +134,9 @@
   <h2>Get it and get involved!</h2>
   <!--=====================================================================-->
 
+  <p>First please review our
+     <a href="http://llvm.org/docs/DeveloperPolicy.html">Developer's Policy</a>.
+
   <p>To check out the code, use:</p>
 
   <ul>