Add: ScoreManager, ScoreBoard

test/test_score_manager.js

@@ -0,0 +1,9 @@
+let scoreManager = new ScoreManager();
+
+QUnit.test( "plusScore", function( assert ) {
+	assert.equal(scoreManager.score, 0);
+	scoreManager.plusScore(10);
+	assert.equal(scoreManager.score, 10);
+	scoreManager.minusScore(10);
+	assert.equal(scoreManager.score, 0);
+});