Start new chat screen (UI)

[alfogrillo]

As a user I want to create a new 1:1 chat with an other user.

• On the home screen is a button to create a new chat
• tapping that button opens a new screen where the users can:
  • search for a another user to begin a chat with
  • start the "create new room" flow
  • start the "invite a friend" flow

Designs
Start a chat

Matrix APIs
No APIs are required for this task

ACs

• A new button is shown in the room list to create a new chat
• The new screen is presented modally
• The user can dismiss the screen to go back to the room list
• Copies are localized
• No other functionality is meant to be implemented as a part of this ticket (eg. search, navigations etc.)
• New: Ignore the recent & suggested users sections (they aren't part of this ticket)
• Suggestions and recents fetching logics will be implemented here.

Tasks

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1. Start new chat screen (UI) vector-im/element-x-android#94
   T-Enhancement Team: Element X Feature X-Needs-Design +3
   
2. Start new chat screen (UI) vector-im/element-x-ios#592
   T-Enhancement Team: Element X Feature +2
   

[alfogrillo]

All the children issues have been completed.