[ref] Add model of School

[Rafalkufel]

We need to store data of schools so we have to create model of School object.

Fields:

1. id
2. schoolName: string - full name of school
3. schoolAddress: string - eg. Grywałd, ul. Konwaliowa 33,
4. schoolPostcode: string - eg. 65-256 Poznań,
5. schoolType: reference to schoolType,

We should disscuss what about school complex (polish Zespół Szkół eg. Zespół Szkół Budowlanych) which contains many different schools (eg Zasadnicza Szkoła Zawodowa or Technikum Budowlane). All that names should be included on the school description.

If you add fixtures to that model it'd be nice.

[agatakozinska]

schoolPostcode I think we should divide this field into postal code and city, not just everything in one input and probably the same with schoolAddress ?
About complexity of school name, it seems, in that case, we don't need information that it's Zespół Szkół Budowlanych only the school a pupil attends because that is written in their ID (the same as a stamp) (https://www.portaloswiatowy.pl/dokumentacja-szkolna-przepisy-ogolne/stemplowanie-legitymacji-szkolnych-w-zespole-szkol-9113.html) , also for e.g. you have XXI Liceum Ogólnokształcące zostało otwarte (...) w budynku Zespołu Szkół Budownictwa Nr 1. it's treated as a building, not institute. Well, I'm not an expert about it, maybe you have better information.

[Rafalkufel]

When it comes to school names. I think, that at this moment we can stay with just bare school name and omit name of complex of school. Later we can just ask people from supporting centers about thier practice.