example: Add display size configuration

Author: Artur Ostręga

example/Gemfile

@@ -3,4 +3,5 @@ source 'https://rubygems.org'
 gem 'yeah', github: 'yeahrb/yeah'
 #gem 'yeah', path: '../'
 gem 'yeah-web', github: 'yeahrb/yeah-web'
+#gem 'yeah-web', path: '../../yeah-web'
 gem 'opal', github: 'opal/opal'

example/README.md

@@ -1,6 +1,6 @@
 # Example Game
 
-A barebones example game included with Yeah.
+Barebones example game for Yeah
 
 ## Usage
 
@@ -14,4 +14,4 @@ Start a web server for the game.
 
 Finally, visit [http://localhost:1234](http://localhost:1234) to run the game in your web browser.
 
-Note: graphical output is in the works.
+Note: graphical output in the game framework is in the works.

example/src/game.rb

@@ -1,5 +1,8 @@
 class ExampleGame < Yeah::Game
   def initialize
+    super
+
     puts "Hello!"
+    display.size = 320, 240
   end
 end