Add installation & usage section to readme

README.md

@@ -21,4 +21,20 @@ Mac OS X Cocoa:
   <img src="https://github.com/jimeh/tomorrow-night-paradise-theme.el/raw/master/preview/gui.png" alt="preview" />
 </div>
 
+## Installation & Usage
+
+### Emacs 24
+
+1. Add the `tomorrow-night-paradise-theme` directory to your Emacs `load-path`
+   and `custom-theme-load-path`.
+2. Add one of the following to your Emacs init file:
+    - `(require 'tomorrow-night-paradise-theme)`
+    - `(load-theme tomorrow-night-paradise t)`
+3. Reload the init file, or restart Emacs.
+
+### Pre-Emacs 24
+
+Not supported, sorry.
+
+
 [tomorrow]: https://github.com/ChrisKempson/Tomorrow-Theme