Add 1-1 chat

[marsbergen]

Context

Our customers have indicated that our current chat function only allows to be used as group chat. However they would also like to start 1-1 chats with each other.

Functional Requirements

• None of the existing chat functionality should be lost
• You should only able to create a new chat with existing contacts
• You should be able to close chats so no one can send message to each other any longer
• Closed messages should appear in an archive so I can still read them at a later moment

Design Requirements

• Within a chat it should be clear who are talking to each other
• There should be an indicator when new (unread) messages have been received
• There should be an indicator when the other person is crafting a message
• You should be able to send a message on a later moment
• You should be able to delete messages sent in the chat