[ONOS-3618] Implement REST API for Meter query, insert, delete

* Implement encode & decode method for MeterBandCodec & MeterCodec
* Implement MetersWebResource
* Add unit test for MeterBandCodec & MeterCodec
* Add unit test for MetersWebResource
* Add meter insertion json example
* Add Swagger doc

Change-Id: I07284c6678c08b3cb9e109e86ffb2cf28bf36447
diff --git a/core/common/src/test/resources/org/onosproject/codec/impl/simple-meter.json b/core/common/src/test/resources/org/onosproject/codec/impl/simple-meter.json
new file mode 100644
index 0000000..21eb38a
--- /dev/null
+++ b/core/common/src/test/resources/org/onosproject/codec/impl/simple-meter.json
@@ -0,0 +1,14 @@
+{
+  "id": 1,
+  "deviceId": "of:0000000000000001",
+  "unit": "KB_PER_SEC",
+  "burst": true,
+  "bands": [
+    {
+      "type": "REMARK",
+      "rate": 10,
+      "prec": 20,
+      "burstSize": 30
+    }
+  ]
+}
\ No newline at end of file