docs: Add initial docs on LLVMBuild organization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143619 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/index.html b/docs/index.html
index 4d74c54..bfca45b 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -226,6 +226,10 @@
 code to be located outside (or inside) the <tt>llvm/</tt> tree, while using LLVM
 header files and libraries.</li>
 
+<li><a href="LLVMBuild.html">LLVMBuild Documentation</a> - Describes the
+LLVMBuild organization and files used by LLVM to specify component
+descriptions.</li>
+
 <li><a href="MakefileGuide.html">LLVM Makefile Guide</a> - Describes how the
 LLVM makefiles work and how to use them.</li>