Adding Windows self check script to docs.

tensorflow/docs_src/install/install_windows.md

@@ -153,6 +153,9 @@ TensorFlow}.
 If the system outputs an error message instead of a greeting, see [Common
 installation problems](#common_installation_problems).
 
+There is also a helpful [script](#https://gist.github.com/mrry/ee5dbcfdd045fa48a27d56664411d41c)
+that helps with Windows TensorFlow installation issues.
+
 ## Common installation problems
 
 We are relying on Stack Overflow to document TensorFlow installation problems