[A] Add Applovin Max SDK

sdk-intergration/Assets/MaxSdk/Scripts/MaxEventSystemChecker.cs

@@ -0,0 +1,37 @@
+//
+//  EventSystemChecker.cs
+//  AppLovin MAX Unity Plugin
+//
+//  Created by Jonathan Liu on 10/23/2022.
+//  Copyright © 2022 AppLovin. All rights reserved.
+//
+
+#if UNITY_EDITOR
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+namespace AppLovinMax.Scripts
+{
+    /// <summary>
+    /// A script to check and enable event system as needed for the AppLovin MAX ad prefabs.
+    /// </summary>
+    [RequireComponent(typeof(EventSystem))]
+    public class MaxEventSystemChecker : MonoBehaviour
+    {
+        private void Awake()
+        {
+            // Enable the EventSystem if there is no other EventSystem in the scene
+            var eventSystem = GetComponent<EventSystem>();
+            var currentSystem = UnityEngine.EventSystems.EventSystem.current;
+            if (currentSystem == null || currentSystem == eventSystem)
+            {
+                eventSystem.enabled = true;
+            }
+            else
+            {
+                eventSystem.enabled = false;
+            }
+        }
+    }
+}
+#endif