feat: implement SignalR notifications for project status changes

ServiceHost/Hubs/ProgramManager/ProjectBoardHub.cs

@@ -0,0 +1,13 @@
+using Microsoft.AspNetCore.SignalR;
+
+namespace ServiceHost.Hubs.ProgramManager;
+
+public class ProjectBoardHub:Hub
+{
+    public override async Task OnConnectedAsync()
+    {
+        Console.WriteLine($"{Context.ConnectionId} connected");
+        await Clients.All.SendAsync("ReceiveGreeting","A new user has connected to the Project Board Hub!");
+        await base.OnConnectedAsync();
+    }
+}