Merge pull request google#678 from pjaytycy/master

Add link to Google Test Primer docs in README.md

Author: BillyDonahue

README.md

@@ -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).