added Obstacle.ts

* resetPosition maby done
 * update done ig

frontend/models/Obstacle.ts

@@ -0,0 +1,23 @@
+class Obstacle {
+    private pipeTop: Entity;
+    private pipeBottom: Entity;
+    private distanceBetweenPipes: number;
+    private padding: number;
+    private speed: number;
+    private static startX: number;
+
+    private resetPosition(){
+        let randomY = Math.random() * (height - this.padding) + this.padding;
+
+        this.pipeTop.height = randomY - this.distanceBetweenPipes / 2;
+        this.pipeTop.position.x = Obstacle.startX;
+
+        this.pipeBottom.height = randomY + this.distanceBetweenPipes / 2;
+        this.pipeBottom.position.x = Obstacle.startX;
+    }
+
+    public update(){
+        this.pipeTop.position.x -= this.speed;
+        this.pipeBottom.position.x -= this.speed;
+    }
+}