Add README.md file

plugins/sublime/README.md

+## sublime
+
+Plugin for Sublime Text, a cross platform text and code editor, available for Linux, Mac OS X, and Windows.
+
+### Requirements
+
+ * [Sublime Text](http://www.sublimetext.com/)
+
+### Usage
+
+ * If `st` command is called without an argument, launch Sublime Text
+
+ * If `st` is passed a directory, `cd` to it and open it in Sublime Text
+
+ * If `st` is passed a file, open it in Sublime Text
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