Add link to LLVM's Getting Started page.
Patch by John Thompson!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78307 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/www/get_started.html b/www/get_started.html
index d8b2791..690a911 100644
--- a/www/get_started.html
+++ b/www/get_started.html
@@ -49,6 +49,16 @@
 follows:</p>
 
 <ol>
+  <li>Get the required tools.
+  <ul>
+    <li>See
+      <a href="http://llvm.org/docs/GettingStarted.html#requirements">
+      Getting Started with the LLVM System - Requirements</a>.</li>
+    <li>Note also that Python is needed for running the test suite.
+      Get it at: <a href="http://www.python.org/download">
+      http://www.python.org/download</a></li>
+  </ul>
+
   <li><a href="http://www.llvm.org/docs/GettingStarted.html#checkout">Checkout
    and build LLVM</a> from SVN head:</li>