Document Databricks/delta-rs protocol version support by release

[Abhishek1005]

Delta Lake feature compatibility between Spark (Databricks) and pandas/dask using the delta-rs(Delta client) library is dependent on the protocol version support.
Some of the latest Databricks Runtime's protocol versions (minWriterVersion and minReaderVersion) do not match with delta-rs protocol support level currently offered. Hence, a majority of the delta features are incompatible with delta-rs library.

Finding the protocol compatibility information should be made easier.

Hence, documenting the protocol version by release would help make this information (compatibility with Delta Clients/Connectors) easier to find.

[ion-elgreco]

Updated the readme in the repo