Implemented a movement controller.

Assets/script/movement/Bullet.cs

@@ -0,0 +1,19 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Bullet : MonoBehaviour
+{
+    Rigidbody2D rb;
+    public float damage;
+    public float time = 2f;
+
+    public void ApplyVel(Vector2 dir,float speed) {
+        rb = GetComponent<Rigidbody2D>();
+        rb.velocity = dir * speed;
+        Destroy(gameObject, time);
+    }
+    private void OnCollisionEnter2D(Collision2D c) {
+        Destroy(gameObject);
+    }
+}