update readme

README.md

@@ -8,7 +8,21 @@ A ruby implementation of Conway's [game of life](http://en.wikipedia.org/wiki/Co
 
 ## Usage
 
-TODO: Write usage instructions here
+To use Life, run the `life new` command. It can be used with the following options
+* `--width` or `-w` specifies how many cells wide the game will be
+* `--height` or `-h` specifies how many cells high the game will be
+* `--generations` or `-g` specifies how many generations the simulation will run
+
+```
+$ life new -w 3 -h 4 -g 5
+```
+This will create a 3x4 game that runs for 5 generations
+
+When first creating a game, you will be prompted to enter which cells are initially alive.
+
+## TODO
+* Ability to pass initial configuration as command-line option
+* Animate instead of displaying all the generations
 
 ## Contributing
 

lib/life/cli.rb

@@ -12,6 +12,7 @@ class Base < Thor
       method_option :width, :type => :numeric, :aliases => '-w', :desc => "Width of board", :required => true
       method_option :height, :type => :numeric,:aliases => '-h', :desc => "Height of board", :required => true
       method_option :generations, :type => :numeric,:aliases => '-g', :desc => "How many generations to display", :required => true
+
       def new
         seed = []
         while yes? "Would you like to add a live cell to the grid? [Y/n]"