Add: menu typing practice

src/game/menu/main_menu_typing_practice.js

@@ -0,0 +1,12 @@
+/////////////////////////////
+// Main game
+
+const CONTENT_ID = "Menu";
+
+let game = new Phaser.Game(
+	GAME_SCREEN_SIZE.x, GAME_SCREEN_SIZE.y,
+	Phaser.CANVAS, CONTENT_ID
+);
+
+game.state.add('MenuTypingPractice', MenuTypingPractice);
+game.state.start('MenuTypingPractice');