Merge branch 'docs' into 'develop'

README.md

declearn/__init__.py

declearn/aggregator/__init__.py

declearn/aggregator/_api.py

declearn/communication/__init__.py

declearn/communication/_build.py

declearn/communication/api/__init__.py

declearn/communication/api/_client.py

declearn/communication/api/_server.py

declearn/communication/api/_service.py

declearn/communication/grpc/__init__.py

declearn/communication/grpc/protobufs/__init__.py

declearn/communication/messaging/__init__.py

declearn/communication/messaging/flags.py

declearn/communication/websockets/__init__.py

declearn/data_info/__init__.py

declearn/data_info/_base.py

declearn/dataset/__init__.py

declearn/dataset/_inmemory.py

declearn/dataset/_sparse.py