add（tools）：添加signalR调试工具

backend/IM_API/Hubs/ChatHub.cs

@@ -0,0 +1,27 @@
+using IM_API.Interface.Services;
+using Microsoft.AspNetCore.SignalR;
+using System.Security.Claims;
+
+namespace IM_API.Hubs
+{
+    public class ChatHub:Hub
+    {
+        private IJWTService _JWTService;
+        public ChatHub(IJWTService jWTService)
+        {
+            _JWTService = jWTService;
+        }
+
+        public override Task OnConnectedAsync()
+        {
+            var userIdStr = Context.User.FindFirstValue(ClaimTypes.NameIdentifier);
+            int userId = int.Parse(userIdStr);
+            Console.WriteLine(userId);
+            return base.OnConnectedAsync();
+        }
+        public async Task SendMessage(string user,string message)
+        {
+            await Clients.Caller.SendAsync("ReceiveMessage", "qwfqwfqw","test");
+        }
+    }
+}