/// <summary>
/// Adds current user to a Group with given group name.
/// </summary>
/// <param name="groupName">
/// Name of group which should be joined.
/// </param>
/// <returns></returns>
public override async Task <string> JoinGroup(string groupName)
{
var user = await _manager.GetUser(connectionId : Context.ConnectionId);
await this._manager.JoinGroup(user, groupName);
return(groupName);
}
