Basic features:
- a user can register;
- a user can post information about placement he lived in;
- information consist of:
- the title of the placement;
- text description of the placement and/or user's opinion;
- photos of the placement;
- the price of the placement;
- address of the placement;
- address of the placement displayed as a location on the google map, which is placed on the placement's page;
- if the placement already exists in the app's database, the user can only leave comments about the placement, and add photos. User can not change, modify or remove placement's information;