Add old vrcboardimage script as vrcboardimagebasic

Materials/Editor/VRCBoardShaderEditor.cs

@@ -0,0 +1,20 @@
+using System.Collections;
+using System.Collections.Generic;
+using UdonSharp;
+using UnityEngine;
+using UnityEditor;
+
+namespace VRCBoard
+{
+    [UdonBehaviourSyncMode(BehaviourSyncMode.Manual)]
+    public class VRCBoardShaderEditor : ShaderGUI 
+    {
+        // Start is called before the first frame update
+        public override void OnGUI(MaterialEditor materialEditor, MaterialProperty[] properties)
+        {
+            EditorGUILayout.LabelField("Please use the VRCBoardImageBasic component to edit the material properties.");
+            //base.OnGUI(materialEditor, properties);
+        }
+    }
+
+}