Add apachie license header

Author: hj-cpdm-son

Samples~/XRController/Controller/Script/XRControllerDisplay.cs

@@ -1,8 +1,27 @@
-using UnityEngine;
-using UnityEngine.InputSystem;
-
-namespace Controller.Script
+// <copyright file="XRControllerDisplay.cs" company="Samsung Electronics Co.">
+//
+// Copyright 2025 Samsung Electronics Co.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace Google.XR.Extensions.Samples.Controller.Script
 {
+    using UnityEngine;
+    using UnityEngine.InputSystem;
+    
     public class XRControllerDisplay : MonoBehaviour
     {
         [Header("Cached")]

Samples~/XRController/README.md

@@ -0,0 +1,12 @@
+# XR Controller Sample
+
+Contains a controller asset and demonstrates its usage.
+
+To enable this sample:
+
+*   Navigate to **Edit** > **Project Settings** > **XR Plug-in Management** >
+    **OpenXR**.
+*   Switch to the **Android** platform tab.
+*   Add **Controller Profile**.
+*   Under **XR Plug-in Management > Project Validation**, fix all **OpenXR**
+    related issues. This will help to configure your **Player Settings**.