Add README.md to cmd/jaeger/integration

Signed-off-by: James Ryans <[email protected]>

cmd/jaeger/integration/README.md

@@ -0,0 +1,16 @@
+# Integration
+
+Jaeger v2 integration tests are built on top of [OTEL Testbed module](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/testbed). OTEL Testbed provide comprehensive tools for conducting end-to-end tests for the OTEL Collector, such as reproducible short-term benchmarks, correctness tests, long-running stability tests and maximum load stress tests. To learn more about OTEL Testbed, please refer to the their [README](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/testbed/README.md)
+
+## kafka_test
+
+Kafka e2e test checks if the pipelines through `kafka` and finally at `remote-storage` have stored match exactly with the provided data using `GoldenDataProvider` (Provides data from the "Golden" dataset generated using pairwise combinatorial testing a.k.a PICT techniques for use in correctness tests) and validated using `CorrectnessTestValidator`.
+
+The pipelines are checked in 2 steps, which the first test case verifies if the spans sent to Kafka are correct, and the second one checks the spans stored in the remote storage.
+![kafka diagram](kafka_diagram.jpeg)
+
+To conduct the tests, run the following command:
+
+```
+scripts/otel-kafka-integration-test.sh [kafka_version=latest] [remote_storage_version=latest]
+```