Adds a readme with a link to the blog post

keyboard/ergodox_ez/keymaps/ordinary/readme.md

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+# The Ordinary Layout. for  users of common keyboards
+
+You can read more about the reasoning behind this layout over at [Nicholas's blog](http://nicholas.rinard.us/2016/03/ergodox-ez-layout.html). The idea is to make a layout that's as familiar as possible for users of "regular" keyboards.
+
+![Ordinary layout](ordinary.png)