doc: add the list of supported protocols

Author: filak-sap

README.md

@@ -11,6 +11,10 @@ way for communication with OData services.
 The goal of this Python module is to hide all OData protocol implementation
 details.
 
+## Supported features
+
+- OData V2
+
 ## Requirements
 
 - [Python >= 3.6](https://www.python.org/downloads/release/python-368/)

docs/index.rst

@@ -17,6 +17,11 @@ PyOData: OData for Pythonistas
 
 Python agnostic implementation of OData client library.
 
+Supported features
+------------------
+
+- OData V2
+
 Basic usage
 -----------