add vr template project

addons/godot-xr-tools/effects/fade.gdshader

@@ -0,0 +1,13 @@
+shader_type spatial;
+render_mode depth_test_disabled, skip_vertex_transform, unshaded, cull_disabled;
+
+uniform vec4 albedo : source_color;
+
+void vertex() {
+	POSITION = vec4(VERTEX.x, -VERTEX.y, 0.0, 1.0);
+}
+
+void fragment() {
+	ALBEDO = albedo.rgb;
+	ALPHA = albedo.a;
+}