Add the Stupid D Compiler to the External Projects list.

llvm-svn: 143020
diff --git a/llvm/docs/ReleaseNotes.html b/llvm/docs/ReleaseNotes.html
index ce4d4bc..10cd002 100644
--- a/llvm/docs/ReleaseNotes.html
+++ b/llvm/docs/ReleaseNotes.html
@@ -452,6 +452,17 @@
 </div>
 
 <!--=========================================================================-->
+<h3>The Stupid D Compiler (SDC)</h3>
+
+<div>
+
+<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
+   project seeking to write a self-hosting compiler for the D programming
+   language without using the frontend of the reference compiler (DMD).</p>
+
+</div>
+
+<!--=========================================================================-->
 <h3>TTA-based Co-design Environment (TCE)</h3>
 
 <div>