Added coliders to buttons, Buttons are clickable

Assets/Scripts/ButtonScript.cs

@@ -0,0 +1,15 @@
+using UnityEngine;
+
+public class ButtonScript : MonoBehaviour
+{
+    public int buttonIndex;
+    public ButtonsMinigame game;
+
+    void OnMouseDown()
+    {
+        game.OnButtonClicked(buttonIndex);
+    }
+
+   
+}
+