GET /study

[kamilsi]

We need an endpoint that will return all existing studies within the DB with their IDs and definitions. The goal of this issue is to create

1. GET /study that returns a simplified list (IDs, names, codes)
2. GET /study/{study_id} that will return full information about the study

[salatak]

According to the previous arrangements, at this moment the study_id, study name and timestamp are listed for the GET /study endpoint. Additionally, I added the randomization method used because it seems important to me - researchers may not remember it.

[salatak]

Created pull request #62 with GET \study and GET \study{study_id} endpoints and tests

[salatak]

Pull request #62 was accepted