text: 
  //permissions?
  
  class Group {
      constructor(users) {
          this.users = users; //list of accountIds
      }
  
      get users() {
          return this.users;
      }
  
      addUser(accountId) {
          this.users.push(accountId);
      }
  
      removeUser(accountId) {
          let index = this.users.indexOf(accountId);
          this.users.splice(index, 1);
      }
  }