Add mention of Tart to external OS projects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142955 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index 74c9afb..3b4bcf6 100644
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -317,6 +317,27 @@
 
   
 <!--=========================================================================-->
+<h3>Tart Programming Language</h3>
+
+<div>
+
+<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
+   strongly typed programming language designed for application
+   developers. Strongly inspired by Python and C#, Tart focuses on practical
+   solutions for the professional software developer, while avoiding the clutter
+   and boilerplate of legacy languages like Java and C++. Although Tart is still
+   in development, the current implementation supports many features expected of
+   a modern programming language, such as garbage collection, powerful
+   bidirectional type inference, a greatly simplified syntax for template
+   metaprogramming, closures and function literals, reflection, operator
+   overloading, explicit mutability and immutability, and much more. Tart is
+   flexible enough to accommodate a broad range of programming styles and
+   philosophies, while maintaining a strong commitment to simplicity, minimalism
+   and elegance in design.</p>
+
+</div>
+
+<!--=========================================================================-->
 <!--
 <h3>PinaVM</h3>