Add: space invaders game

src/game/mouse/space_invaders/main.js

@@ -3,10 +3,13 @@
 
 const CONTENT_ID = "Space Invaders";
 
-var game = new Phaser.Game(960, 540, Phaser.CANVAS, CONTENT_ID);
+let game = new Phaser.Game(
+	GAME_SCREEN_SIZE.x, GAME_SCREEN_SIZE.y,
+	Phaser.CANVAS, CONTENT_ID
+);
 
 game.state.add('Loading', Loading);
 game.state.start('Loading');
 
-// game.state.add('Login', Login);
+game.state.add('Game', Game);
 // game.state.add('Menu', Menu);