Update docs

Author: marvinbuss

README.md

@@ -53,6 +53,10 @@ The Azure Function code is written in Python and leverages the new [Web Framewor
 
 This sample uses FastAPI as a baseline which is a scalable, modern, fast and proven web framework for APIs built in Python. More details about FastAPI can be found [here](https://fastapi.tiangolo.com/).
 
+### Open Telemetry
+
+This sample uses Open Telemetry and the FastAPI and Azure Application Insights integration for end to end tracking of API calls using logs and metrics and dependency calls. More information about Open Telemetry can be found [here](https://opentelemetry.io/).
+
 ### Testing
 
 Testing of the Azure Functon application code. The testing is done using `pytest`. Tests are stored in the [`/tests` folder](/tests/) and should be extended for new functionality that is being implemented over time. The `pytest.ini` is used to reference the Azure Functon project for imports. This file makes sure that the respective python objects from the Azrue Function application code can be imported into the tests and validated accordingly.