Added a perl script to check many aspects of Wine configuration.

diff --git a/README b/README
index 77284dd..f427584 100644
--- a/README
+++ b/README
@@ -140,6 +140,9 @@
 
 See http://www.winehq.com/config.html for further configuration hints.
 
+In order to verify the correctness of the environment you need for
+Wine to run successfully, run "./tools/winecheck | less".  You'll get
+a percentage score indicating "Wine configuration correctness".
 
 6. RUNNING PROGRAMS