create teams module

[bnguyenngoc]

a user can:

• create a team
• join a team
  -delete team (if he is the captain)

a team has:

• a team name
• a team id/token (for other users to join)
• total points earned

in teams page
a player can:

• view teams
• view leaderboard
• view recent achievements (Summary)
  an admin can:
• view teams
• view leaderboard
  -view recent achievements (Summary)
• edit team (change token id for example or deleting team)