Prototyping in Atomic

See the full prototype here:
https://app.atomic.io/d/HkIzSQLgl1Mk

Rebound based on the @Atomic article to make high-fi prototypes in under 10 minutes (https://medium.com/@we_are_atomic/tutorial-how-to-make-a-hi-fi-prototype-in-atomic-in-under-10-minutes-f8a49e7eebfe).

I've added some small details to further illustrate the power in Atomic:
- Per-element animations for city details
- Moon is now a crescent moon
- 7-day forecast is scrollable
- Swipe down from the top to see settings

The additional details took me about 10 minutes to create.