docker image and API doc

[Han Su]

To better collaborate and integrate meeting.rs to voce.chat, we would like to see an API documentation and a docker image.
APIs we'd like to see include:

• Initialization. Calling this is equivalent to having a meeting.rs client, which can be used for event listening, such as who initiated audio and video towards me.
• Create a room. The room number must be unique. We will use meeting.rs in the direct message (DM) settings, which can also be considered as a room for two people. Upon successful creation, we have to notify the other party.
• Leave & destroy the room.