Create README.md

Define placeholder test for IC-1.1 . This test is to validate different drop counters for data-plane traffic.

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

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+# IC-1.1: Test different drop counters for data-plane traffic
+
+## Summary
+This is to test the different data-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-1.1.1 - [TODO:] Exercise adverse-aggregate drop counter
+
+* IC-1.1.2 - [TODO:] Exercise congestion-aggregate drop counter
+
+* IC-1.1.3 - [TODO:] Exercise packet-processing-aggregate drop counter
+
+* IC-1.1.4 - [TODO:] Exercise no-route drop counter
+
+* IC-1.1.4 - [TODO:] Exercise vendor drop counter
+
+
+  
+## 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/drop/state/adverse-aggregate
+/components/component/integrated-circuit/pipeline-counters/drop/state/congestion-aggregate
+/components/component/integrated-circuit/pipeline-counters/drop/state/no-route
+/components/component/integrated-circuit/pipeline-counters/drop/state/urpf-aggregate
+/components/component/integrated-circuit/pipeline-counters/drop/vendor
+
+rpcs:
+  gnmi:
+    gNMI.Subscribe:
+      sample_interval: 5000000000
+```