Adds new documentation to readme

README.md

@@ -50,7 +50,35 @@ If you want to use Nyan Cat as your default formatter, simply put the options in
 Playing the Nyan Cat song 
 -------------------------
 
-If you want to play the Nyan Cat song in tandom with nyan-cat-formatter, simply copy the ".nyan-cat.mp3" file to your home directory.
+If you want to play the Nyan Cat song in tandom with nyan-cat-formatter, there are two options:
+
+1. Play the song by default:
+
+Remove the following option from your .rspec file:
+
+```
+--format NyanCatFormatter
+```
+
+And add the following option to your .rspec file:
+
+```
+--format Play
+```
+
+2. Play the song only when desired using a command line option:
+
+Make sure the following option is in your .rspec file:
+
+```
+--format NyanCatFormatter
+```
+
+And use the following command when running specs:
+
+```
+$ rspec spec -f Play
+```
 
 This currently only works on Mac OSx.