Create README.md

added IC-1: Test aggregate drop counters for control-plane traffic test

feature/platform/integrated_circuit/pipeline-counters/control-plane/README.md

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+# IC-1: Test aggregate drop counters for control-plane traffic
+
+## Summary
+This is to test the different control-plane counters under the pipeline container. 
+
+
+## Procedure
+
+* Test environment setup
+    ```mermaid
+    graph LR; 
+    A[ATE1:interface1]  <-- L3 connection --> B[interface1:DUT];
+    ```
+    * Make a L3 connection between the ATE and the DUT. This doesnt have to be a lag bundle.
+
+
+* IC-1.0.1 - Exercise aggregate counters
+
+  * Generate significant amount of traffic with the IP Options field set. This can be Option type 7 for record route. Also set the TTL of the packet to "1".
+  * Check changes in the different state paths under the pipeline-counters container.
+  * Check if the NOS has support for the leaves under the `vendor` container to identify the type of packet causing Queue increase as well as changes in the drop counters.
+
+
+## OpenConfig Path and RPC Coverage
+
+This example yaml defines the OC paths intended to be covered by this test.  OC paths used for test environment setup are not required to be listed here.
+
+```yaml
+paths:
+  # interface configuration
+/components/component/integrated-circuit/pipeline-counters/control-plane-traffic/state/dropped-aggregate
+/components/component/integrated-circuit/pipeline-counters/control-plane-traffic/state/dropped-bytes-aggregate
+/components/component/integrated-circuit/pipeline-counters/control-plane-traffic/state/queued-aggregate
+/components/component/integrated-circuit/pipeline-counters/control-plane-traffic/state/queued-bytes-aggregate
+/components/component/integrated-circuit/pipeline-counters/control-plane-traffic/vendor
+
+rpcs:
+  gnmi:
+    gNMI.Set:
+      union_replace: true
+    gNMI.Subscribe:
+      on_change: true
+```