adding security

app/Shared/MainLayout.razor

@@ -1,4 +1,5 @@
 @inherits LayoutComponentBase
+@using Microsoft.AspNetCore.Components.Authorization
 
 <div class="page">
     <div class="sidebar">
@@ -7,7 +8,15 @@
 
     <div class="main">
         <div class="top-row px-4">
-            <a href="http://blazor.net" target="_blank" class="ml-md-auto">About</a>
+            <AuthorizeView>
+                <Authorized>
+                    Hello, @context.User.Identity.Name!
+                    <a href="/.auth/logout?post_logout_redirect_uri=/">Log out</a>
+                </Authorized>
+                <NotAuthorized>
+                    <a href="/login-providers">Log in</a>
+                </NotAuthorized>
+            </AuthorizeView>
         </div>
 
         <div class="content px-4">