public async Task<Room> CreateRoomAsync(string groupId, CreateRoomRequest request)
        {
            string url = _baseApiAddress + $"groups/${groupId}/rooms";

#if __IOS__ || __ANDROID__ || NET45
            var content = new StringContent(JsonConvert.SerializeObject(request));
#endif
#if NETFX_CORE
            var content = new HttpStringContent(JsonConvert.SerializeObject(request));
#endif

            return await HttpClient.PostAsync<Room>(url, content);
        }
 public IObservable<Room> CreateRoom(string groupId, CreateRoomRequest request)
 {
     return _apiService.CreateRoomAsync(groupId, request).ToObservable();
 }