Implement initial UI framework and views for iOS

[devinbileck]

Bounty: $500 USD*

*To be compensated via the Bisq DAO in the USD equivalent of BSQ at the time of submitting a compensation request.

In order to claim the bounty, the following criteria must be satisfied:

• Written in native Swift using latest framework/libraries.
• Follows iOS design guidelines.
• Follows Swift design guidelines and a consistent style such as Google's or raywenderlich.
• Integrates into the project structure, as setup by Setup initial project #1.
• Builds successfully without errors.
• Implements the legacy pairing process views following the designs specified here. The pairing process does not need to work, as the business logic will be implemented in Implement pairing process #24; just need a click through prototype.
• Implements a notifications view following the designs specified here. This should be the primary/initial view. Dummy notifications can be generated for demonstration purposes as the actual implementation will be done in Receive native OS push notification alerts #6.
• Implements a settings view that has options to re-run the pairing process, delete all notifications, mark all as read following the designs specified here.

[devinbileck]

Closing this as I have split this up into separate issues.