add the sensor examples

.vscode/tasks.json

@@ -67,7 +67,11 @@
                 "lock-app",
                 "thermostat",
                 "window-app",
-                "smart-plug-app"
+                "smart-plug-app",
+                "temperature-measurement-app",
+                "occupancy-sensor-app",
+                "humidity-sensor-app",
+                "contact-sensor-app"
             ],
             "default": ""
         },

examples/contact-sensor-app/contact-sensor-common/BUILD.gn

@@ -0,0 +1,24 @@
+# Copyright (c) 2020 Project CHIP Authors
+#
+# 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.
+
+import("//build_overrides/chip.gni")
+
+import("${chip_root}/src/app/chip_data_model.gni")
+
+chip_data_model("contact-sensor-common") {
+  zap_file = "contact-sensor-app.zap"
+
+  zap_pregenerated_dir = "${chip_root}/zzz_generated/contact-sensor-app/zap-generated"
+  is_server = true
+}