init input sample scene

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Assets/Scenes/InputSystem/ARController.inputactions

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+    "name": "ARController",
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+            "name": "ARTouchScreen",
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+                    "path": "<Touchscreen>/primaryTouch",
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Assets/Scenes/InputSystem/InputSystem_PlaceOnPlane.cs

+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.XR.ARFoundation;
+using UnityEngine.XR.ARSubsystems;
+using UnityEngine.InputSystem;
+
+namespace UnityEngine.XR.ARFoundation.Samples
+{
+    public class InputSystem_PlaceOnPlane : MonoBehaviour
+    {
+
+        [SerializeField]
+        [Tooltip("Instantiates this prefab on a plane at the touch location.")]
+        GameObject m_PlacedPrefab;
+
+        /// <summary>
+        /// The prefab to instantiate on touch.
+        /// </summary>
+        public GameObject placedPrefab
+        {
+            get { return m_PlacedPrefab; }
+            set { m_PlacedPrefab = value; }
+        }
+
+        /// <summary>
+        /// The object instantiated as a result of a successful raycast intersection with a plane.
+        /// </summary>
+        public GameObject spawnedObject { get; private set; }
+
+        void Awake()
+        {
+            m_RaycastManager = GetComponent<ARRaycastManager>();
+        }
+
+        public void AddObject(InputAction.CallbackContext context)
+        {
+            Debug.Log("Spawn!");
+            var touchPosition = context.ReadValue<Vector2>();
+            Debug.Log(touchPosition);
+            if (m_RaycastManager.Raycast(touchPosition, s_Hits, TrackableType.PlaneWithinPolygon))
+            {
+                // Raycast hits are sorted by distance, so the first one
+                // will be the closest hit.
+                var hitPose = s_Hits[0].pose;
+
+                if (spawnedObject == null)
+                {
+                    spawnedObject = Instantiate(m_PlacedPrefab, hitPose.position, hitPose.rotation);
+                }
+                else
+                {
+                    spawnedObject.transform.position = hitPose.position;
+                }
+            }
+        }
+
+        // Update is called once per frame
+        void Update()
+        {
+
+        }
+
+        static List<ARRaycastHit> s_Hits = new List<ARRaycastHit>();
+
+        ARRaycastManager m_RaycastManager;
+    }
+
+}

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