Add include-what-you-use to the External Projects list.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143073 91177308-0d34-0410-b5e6-96231b3b80d8
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 </div>
 
 <!--=========================================================================-->
+<h3>include-what-you-use</h3>
+
+<div>
+
+<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
+   is a tool to ensure that a file directly <code>#include</code>s
+   all <code>.h</code> files that provide a symbol that the file uses. It also
+   removes superfluous <code>#include</code>s from source files.</p>
+
+</div>
+
+<!--=========================================================================-->
 <h3>LanguageKit and Pragmatic Smalltalk</h3>
 
 <div>