Implemented Login workflow

SpotiParty.Web/Components/Pages/LoginPage.razor

@@ -0,0 +1,17 @@
+@page "/login"
+@using SpotiParty.Web.Services
+
+<a class="button-primary" href="@_uri">Mit Spotify einloggen</a>
+
+@inject AuthorizationHandler AuthHandler
+
+@code {
+
+    private Uri _uri = null!;
+
+    protected override async Task OnInitializedAsync() {
+        await base.OnInitializedAsync();
+        _uri = await AuthHandler.ConstructLoginUri();
+    }
+
+}