feat: add user management, refs NOISSUE

song_of_the_day/Pages/Shared/_LoginView.cshtml

@@ -0,0 +1,36 @@
+@using Microsoft.AspNetCore.Authentication
+
+<div class="loginform">
+    @if (!this.User.Identity.IsAuthenticated)
+    {
+        <form method="post" action="Auth/Login">
+            <div>
+                <label for="username">Username:</label>
+            </div>
+            <div>
+                <input name="username" type="text" />
+            </div>
+            <div>
+                <label for="password">Password:</label>
+            </div>
+            <div>
+                <input name="password" type="password" />
+            </div>
+            <div>
+                <input name="submit" type="submit" value="Login" />
+            </div>
+        </form>
+    }
+    else
+    {
+        <form method="post" action="Auth/Logout">
+            <div>
+                Welcome, @User.Identity.Name!
+            </div>
+            <div>
+                <input name="submit" type="submit" value="Logout" />
+            </div>
+        </form>
+    }
+
+</div>