Backend server for teamcodes
- /addteam:
- Methods: Post
- input: team_code, user_id
- output: error: error message/success
- /jointeam:
- Methods: Post
- input: team_code, user_id
- output: error: error message/success
- getTeamInfo/<team_code>:
- Methods: Get
- input: team_code
- output: - error: error message/success
- owner: owner user id
- members: array of user ids