update readme

Author: bolandrm

README.md

@@ -1,6 +1,28 @@
 # SassC::Rails [![Build Status](https://travis-ci.org/bolandrm/sassc-rails.svg)](https://travis-ci.org/bolandrm/sassc-rails) [![Gem Version](https://badge.fury.io/rb/sassc-rails.svg)](http://badge.fury.io/rb/sassc-rails)
 
-### WIP.
+We all love working with Sass, but compilation can take quite a long time for larger
+codebases.  This gem integrates the C implementation of Sass,
+[libsass](https://github.com/sass/libsass), into the asset pipeline.
+
+In one larger project, this made compilation 4x faster:
+
+```
+# Using sassc-rails
+
+[1] pry(main)> Benchmark.bm { |bm| bm.report { Rails.application.assets["application.css"] } }
+       user     system      total        real
+   1.720000   0.170000   1.890000 (  1.936867)
+
+# Using sass-rails
+
+ [1] pry(main)> Benchmark.bm { |bm| bm.report { Rails.application.assets["application.css"] } }
+       user     system      total        real
+  7.820000   0.250000   8.070000 (  8.106347)
+```
+
+This should essentially be a drop in alternative to [sass-rails](https://github.com/rails/sass-rails).
+
+_Note:  This is a new project, please report any issues you come across!_
 
 ## Installation
 
@@ -15,14 +37,11 @@ And then execute:
     $ bundle
 
 
-## Usage
-
-TODO: Write usage instructions here
-
 ## Contributing
 
 1. Fork it ( https://github.com/[my-github-username]/sassc-rails/fork )
-2. Create your feature branch (`git checkout -b my-new-feature`)
-3. Commit your changes (`git commit -am 'Add some feature'`)
-4. Push to the branch (`git push origin my-new-feature`)
-5. Create a new Pull Request
+1. Create your feature branch (`git checkout -b my-new-feature`)
+1. Commit your changes (`git commit -am 'Add some feature'`)
+1. Add Tests
+1. Push to the branch (`git push origin my-new-feature`)
+1. Create a new Pull Request