[Suggestion] Add dark theme

[SocietasEvanescentes]

This isn't an issue, but more of a wish lish. Dark themes are nice and alot easier on the eyes. Love the app!

[housseindjirdeh]

Thank you I'm glad you like the app so much 👍

This can be a cool addition but definitely not critical in my opinion. If someone would like to get their hands building this out sooner rather than later however, that would be awesome :)

Will love to come to a complete consensus before this feature is stared. Here's what I 'm thinking:

1. Leverage an HOC to accept theme as a prop OR use a theming library like react-native-theme
2. Switching themes can be done in the authenticated user profile screen in the same settings screen we'll eventually add as part of Update profile details #8. Clicking a switch theme ListItem there can just open an Action Sheet (or we can have a list of radio buttons of available themes that the user can select maybe?)

Will love to hear other people's thoughts on this!

[rancidfrog]

Dark theme and transparent theme would be great.
Twidere - https://github.com/TwidereProject/Twidere-Android
is a twitter client with transparent theme.
Frost-for-Facebook - https://github.com/AllanWang/Frost-for-Facebook
also has Glass transparent theme.