- added links to README.md for tracing and metrics

Author: prajwalvathreya

README.md

@@ -29,6 +29,9 @@
   - [Contributing](docs/contributing.md)
 - [Observability](docs/observability.md)
   - [Metrics](docs/metrics-documentation.md)
+    - [How to opt-in for Metrics](docs/observability.md#steps-to-opt-in-for-the-csi-driver-metrics)
+  - [Tracing](docs/tracing-documentation.md)
+    - [How to opt-in for Tracing](docs/observability.md#steps-to-opt-in-for-tracing-in-the-csi-driver)
 - [License](#license)
 - [Disclaimers](#-disclaimers)
 - [Community](#-join-us-on-slack)