Ported progress from SPA and began scaffolding Identity UI.

Laid some groundwork in backend.

Began customizing Identity UI.

Props/Areas/Identity/Pages/Account/Manage/_Layout.cshtml

@@ -0,0 +1,32 @@
+@{
+    if (ViewData.TryGetValue("ParentLayout", out var parentLayout))
+    {
+        Layout = (string)parentLayout;
+    }
+    else
+    {
+        Layout = "/Areas/Identity/Pages/_Layout.cshtml";
+    }
+}
+
+<div class="container">
+    <h1>Manage your account</h1>
+
+    <div>
+        <h4>Change your account settings</h4>
+        <hr />
+        <div class="row">
+            <div class="col-md-3">
+                <partial name="_ManageNav" />
+            </div>
+            <div class="col-md-9">
+                @RenderBody()
+            </div>
+        </div>
+    </div>
+</div>
+
+
+@section Scripts {
+@RenderSection("Scripts", required: false)
+}