Add link to Google Test Primer docs in README.md

On google code, the main documentation pages were the "Google Test Primer" content. Currently it's hard to find that content on github, so add a direct link in the main README.md.

Add link to Google Test Primer docs in README.md
d8df1fb4 · Pieter-Jan Busschaert · 13206d6f · d8df1fb4
Commit d8df1fb4 authored Jan 06, 2016 by Pieter-Jan Busschaert
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@@ -14,6 +14,9 @@ mailing list for questions, discussions, and development.  There is
 also an IRC channel on OFTC (irc.oftc.net) #gtest available.  Please
 join us!

+Getting started information for **Google Test** is available in the 
+[Google Test Primer](googletest/docs/Primer.md) documentation.
+
 **Google Mock** is an extension to Google Test for writing and using C++ mock
 classes.  See the separate [Google Mock documentation](googlemock/README.md).