Added README file

README.md

@@ -0,0 +1,30 @@
+# TicTacToe
+
+Sinatra Tic Tac Toe game built around a Ruby Tic Tac Toe gem.
+
+## Installation
+
+Clone the git repository
+
+    $ git clone https://github.com/lisahamm/sinatra_tic_tac_toe
+
+Then `cd` into the directory
+
+    $ cd sinatra_tic_tac_toe
+
+Install dependencies
+
+    $ bundle install
+
+Run app
+
+    $ ruby tic_tac_toe_controller.rb
+
+## Usage
+
+The game is setup for two human players or one human player and an unbeatable computer player.
+The human player can pick its mark ('X' or 'O') and its turn order (first or second).
+Human players must click on a cell/square to set the corresponding cell with their mark.
+
+
+