Add readme

README.md

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+
+```
+$ git clone https://github.com/jlongster/jscodefmt.git
+$ cd jscodefmt
+$ npm install -g .
+$ jscodefmt file.js
+```
+
+It's most useful when integrated with your editor, so see `editors` to
+for editor support. Currently only Emacs integration exists.
+
+To integrate in Emacs, add the following code. This will format the
+file when saved.
+
+```elisp
+(require 'jscodefmt)
+(add-hook 'js-mode-hook
+          (lambda ()
+            (add-hook 'before-save-hook 'jscodefmt-before-save)))
+```