Moved classes his own files

Intro.js

@@ -0,0 +1,17 @@
+class Intro {
+    constructor(ctx) {
+        this.ctx = ctx;
+        this.x = ctx.canvas.width;
+        this.y = ctx.canvas.height / 2 - 48;
+    }
+    update() {
+        this.centerText('BreakOut', this.y, '48px', 'Consolas', 'Black');
+        this.centerText('JDG', this.y + 50, '24px', 'Consolas', 'Black');
+    }
+    centerText(txt, y, s, f, c) {
+        this.ctx.font = s + ' ' + f;
+        this.ctx.fillStyle = 'Black';
+        let x = (this.ctx.canvas.width - this.ctx.measureText(txt).width) / 2;
+        this.ctx.fillText(txt, x, y);
+    }
+}