Added touch grid sensor plugin.

PiperOrigin-RevId: 527512624
Change-Id: I0f316eb6eb2c52472abbec484e5538b66ba2e82e

plugin/sensor/sensor.cc

@@ -0,0 +1,22 @@
+// Copyright 2023 DeepMind Technologies Limited
+//
+// 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.
+
+#include <mujoco/mjplugin.h>
+#include "touch_grid.h"
+
+namespace mujoco::plugin::sensor {
+
+mjPLUGIN_LIB_INIT { TouchGrid::RegisterPlugin(); }
+
+}  // namespace mujoco::plugin::sensor