Mock UI - Welcome Screen

[karalabe]

The welcome screen is aimed to be the landing page for the app. I'm kind of happy with how it looks at the moment. Of course tweaks and polishes are always welcome.

• [ ] The most essential information I'd like it to convey are a description of what the app is/does and an emphasis that it's private/secure by design. If anyone has suggestions on better wording, content that should be added/removed, opinions welcome.
• [ ] Like all other screens, this too is currently a hacky mock-up code wise (check WelcomeScreen in https://github.com/coronanet/rn-coronanet/blob/master/App.js). I'd be happy for help on getting it into a semi final/decent shape. This would entail:
  • [ ] Move the type into its own separate file.
  • [ ] I'm unsure how the layout responsiveness behaves if the screen is not large enough? I think currently it just overflows on both the top and the bottom. That would be bad since we need the button visible. In that case, we should only push upwards. Maybe add a fallback scrollbar for some edge cases?
  • [ ] No idea what happens in landscape mode or even what should happen in that case. Ideas?
  • [ ] The code in general was written by me - someone with 0 UI, RN and mobile experience. Please rewrite anything that would make sense.

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The welcome screen looks like this as of March 15, 2020:

[daodesigner]

[0mkara]

• [ ] I'm unsure how the layout responsiveness behaves if the screen is not large enough? I think currently it just overflows on both the top and the bottom. That would be bad since we need the button visible. In that case, we should only push upwards. Maybe add a fallback scrollbar for some edge cases?

PR #7 does some fundamental restructure of the components. Attends the above issue. Also enabled Create user functionality.

Please review and merge.