title: Socket.io join another client to a room
body: <p>My goal is when A user click on B user, they'll join in a room. I'm holding socket.id in array for all clients.</p>
  
  <pre><code>//CLIENT SIDE FOR A//
  $('.chat-start').on('click', function(event) {
          event.preventDefault();
          var room_id = '72xaz132s'
          var target_id = $('.target').data('id');
          socket.emit('force join room', room_id, target_id);
      });
  
  //SERVER SIDE FOR A AS AN EXAMPLE//
  
  var clients {'customIDA' : socket.id for a, 'customIDB' : socket.id for b}
  
  socket.on('force join room', function (roomid, customIDB) { 
          socket.join(chat_id); //CLIENT A JOINS ROOM//
      })
  </code></pre>
  
  <p>Client A joins room without problem, but how can i add also client B on same room ?</p>