[Swift][Elixir]implement chat server and client

Implement Chat Server with Phoenix and chat client with iOS application.

Server

• https://github.com/KazuCocoa/my_chat_ex/tree/master

After running the server, you can open chat page, http://localhost:4000/, via browser.
The server has no DB. So, history will be deleted if someone reload browser.

Client

• https://github.com/KazuCocoa/WebSocketDemoForiOS/tree/master
• connect to http://localhost:4000/socket/websocket as websocket

Only join the room and send pre-set message to the server.
Don’t support display all chat message, store message and so on.

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