Added rest of the sequencing

Assets/Scripts/Counter.cs

@@ -0,0 +1,21 @@
+using UnityEngine;
+using UnityEngine.Events;
+
+public class Counter : MonoBehaviour
+{
+    [SerializeField]
+    private int _count = 0;
+
+    [SerializeField]
+    private int _maxCount = 4;
+
+    [SerializeField]
+    private UnityEvent _onAllDone;
+    
+    public void Count()
+    {
+        _count++;
+        if(_count>=_maxCount)
+            _onAllDone.Invoke();
+    }
+}