Create feed view

[pjeziorowski]

Make feed view look like the mockup:
https://xd.adobe.com/view/0ed61c5e-a4d7-4979-7384-cad631e2cc5d-78e7/?fullscreen

Note that this tasks depends on #5 - #5 needs to be finished first.

If backend API is not ready yet at the time of starting this task, please do some assumptions and mock data based on GraphQL schema https://github.com/appwish/graphqlapi/tree/master/src/main/resources/schema

Create all needed UI components.