Add an illustrated readme file

Author: Alhadis

README.md

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+Emacs Lisp Support
+==================
+
+Hand-crafted syntax highlighting and editor commands for Emacs Lisp in Atom.
+
+<img src="https://raw.githubusercontent.com/Alhadis/language-emacs-lisp/static/figure-1.png" width="802" alt="Atomacs" />
+
+
+Commands
+--------
+This package includes two commands to run Lisp code in Emacs from Atom:
+
+* `language-emacs-lisp:run-selection`
+* `language-emacs-lisp:run-file`
+
+<img src="https://raw.githubusercontent.com/Alhadis/language-emacs-lisp/static/figure-2.png" width="464" alt="Math: One not even" />
+
+These aren't attached to any keybindings by default. You'll need to assign them
+[shortcuts](http://flight-manual.atom.io/behind-atom/sections/keymaps-in-depth/)
+yourself.
+
+**NOTE:**
+These require Emacs to be in your `$PATH`, and probably don't work on Windows.