fix：1、添加项目

Assets/MaxSdk/Scripts/MaxSdk.cs

@@ -0,0 +1,26 @@
+//
+// AppLovin MAX Unity Plugin C# Wrapper
+//
+
+public class MaxSdk :
+#if UNITY_EDITOR
+    // Check for Unity Editor first since the editor also responds to the currently selected platform.
+    MaxSdkUnityEditor
+#elif UNITY_ANDROID
+    MaxSdkAndroid
+#elif UNITY_IPHONE || UNITY_IOS
+    MaxSdkiOS
+#else
+    MaxSdkUnityEditor
+#endif
+{
+    private const string _version = "8.3.1";
+
+    /// <summary>
+    /// Returns the current plugin version.
+    /// </summary>
+    public static string Version
+    {
+        get { return _version; }
+    }
+}