Scripts to generate test data

[HermanPlay]

Create scripts which will allow to generate test in database. It should create:

• Users with different rols
• Different tasks (task archive should be stored in fixtures folders)
• Groups (with some users)
• Contests (containing created tasks)
• Submissions (Both for tasks and contest tasks)
  Every parameter should be configurable such as how much users to create, how many of each role there to be, etc. The script should be written in go and placed in /cmd/generate-test-data folder to be a runnable.