Added app loaders and screen for the ui. Added identity service. Started auth screens

Moonlight.Client/Interfaces/IAppScreen.cs

@@ -0,0 +1,10 @@
+using Microsoft.AspNetCore.Components;
+
+namespace Moonlight.Client.Interfaces;
+
+public interface IAppScreen
+{
+    public int Priority { get; }
+    public Task<bool> ShouldRender(IServiceProvider serviceProvider);
+    public RenderFragment Render();
+}