initial readme

Author: schacon

README.md

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+Online Git Reference
+====================
+
+I've been giving out git reference cards and wanted a sort of online version
+of that.  A list of the common commands, grouped by task, with the common
+invocations in an easy to reference site.  This is my shot at that site - 
+hopefully it is a nice way to get into this stuff if someone is intimidated
+by the pro git book.