add: demo server and client

demo_server/demo_client/.openapi-generator/FILES

@@ -0,0 +1,44 @@
+.github/workflows/python.yml
+.gitignore
+.gitlab-ci.yml
+.travis.yml
+README.md
+docs/ClaimIceCandidatesResponse.md
+docs/GoogleProtobufAny.md
+docs/IceCandidate.md
+docs/IceSessionDescription.md
+docs/Knock.md
+docs/ListKnocksResponse.md
+docs/PeerNetServiceApi.md
+docs/Room.md
+docs/Server.md
+docs/Service.md
+docs/Status.md
+git_push.sh
+openapi_client/__init__.py
+openapi_client/api/__init__.py
+openapi_client/api/peer_net_service_api.py
+openapi_client/api_client.py
+openapi_client/api_response.py
+openapi_client/configuration.py
+openapi_client/exceptions.py
+openapi_client/models/__init__.py
+openapi_client/models/claim_ice_candidates_response.py
+openapi_client/models/google_protobuf_any.py
+openapi_client/models/ice_candidate.py
+openapi_client/models/ice_session_description.py
+openapi_client/models/knock.py
+openapi_client/models/list_knocks_response.py
+openapi_client/models/room.py
+openapi_client/models/server.py
+openapi_client/models/service.py
+openapi_client/models/status.py
+openapi_client/py.typed
+openapi_client/rest.py
+pyproject.toml
+requirements.txt
+setup.cfg
+setup.py
+test-requirements.txt
+test/__init__.py
+tox.ini