added gun models and enemy spawner

Assets/Scripts/CameraShake.cs

@@ -0,0 +1,53 @@
+using UnityEngine;
+
+public class CameraShake : MonoBehaviour
+{
+    public static CameraShake Instance { get; private set; }
+
+    private float shakeDuration = 0f;
+    private float shakeIntensity = 0f;
+    private float shakeFalloff = 1f;
+
+    private Vector3 originalLocalPos;
+    private bool shaking = false;
+
+    void Awake()
+    {
+        Instance = this;
+        originalLocalPos = transform.localPosition;
+    }
+
+    void LateUpdate()
+    {
+        if (!shaking) return;
+
+        if (shakeDuration > 0f)
+        {
+            Vector3 offset = Random.insideUnitSphere * shakeIntensity;
+            offset.z = 0f; // Keep shake on X/Y only
+            transform.localPosition = originalLocalPos + offset;
+
+            shakeDuration -= Time.deltaTime;
+            shakeIntensity = Mathf.Lerp(shakeIntensity, 0f, Time.deltaTime * shakeFalloff);
+        }
+        else
+        {
+            shaking = false;
+            shakeDuration = 0f;
+            transform.localPosition = originalLocalPos;
+        }
+    }
+
+    /// <summary>
+    /// Trigger a camera shake.
+    /// </summary>
+    /// <param name="duration">How long to shake (seconds)</param>
+    /// <param name="intensity">How far to displace the camera</param>
+    public void Shake(float duration, float intensity)
+    {
+        shakeDuration = duration;
+        shakeIntensity = intensity;
+        shakeFalloff = intensity / duration;
+        shaking = true;
+    }
+}