add a link

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40614 91177308-0d34-0410-b5e6-96231b3b80d8

www/index.html

@@ -27,6 +27,8 @@ list.  If you are interested in contributing to it or following its progress,
 please join the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits">
 cfe-commits</a> list.</p>
 
+<p>A rough <a href="docs/InternalsManual.html">Internals Manual</a> is 
+available.</p>
 
 <p>Please note that we don't consider this to be ready for people to take and
 compile random pieces of code with yet.  However, if you'd like to do so