Feature/chat signalr

Tsi1.Api/Tsi1.BusinessLayer/Services/ChatService.cs

-using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -35,7 +35,6 @@ namespace Tsi1.BusinessLayer.Services
             return result;
         }
 
-        //public async Task<ServiceResult<Group>> GetGroupByName(string groupName)
         public async Task<Group> GetGroupByName(string groupName)
         {
             var result = new ServiceResult<Group>();