Add rainbow image scripts

Assets/Scripts/RainbowSpriteRender.cs

@@ -0,0 +1,21 @@
+using UnityEngine;
+
+public class RainbowSpriteRender : MonoBehaviour
+{
+    public float frequency = 1f;
+    private SpriteRenderer targetImage;
+
+    void Awake()
+    {
+        targetImage = gameObject.GetComponent<SpriteRenderer>();
+    }
+
+    void Update()
+    {
+        float t = Time.time * frequency;
+        float r = Mathf.Sin(t) * 0.5f + 0.5f;
+        float g = Mathf.Sin(t + 2f) * 0.5f + 0.5f;
+        float b = Mathf.Sin(t + 4f) * 0.5f + 0.5f;
+        targetImage.color = new Color(r, g, b);
+    }
+}