Create cards (mobile)

## Summary
We need a flow where user wil be able to create new cards and able to add the respective platform links to those.


## Acceptance Criteria
- [ ] Able to create card
- [ ] Able to add platform links to cards
- [ ] Able to share cards
- [ ] Able to generate QR for that card
- [ ] Tests added
- [ ] docs updated

## Area
`backend` / `mobile`

## Difficulty
medium