Addet employee frontend and move header to a componet

PointOfSale/Pos.Web/Components/Shared/Header.razor

@@ -0,0 +1,12 @@
+@rendermode InteractiveServer
+@implements IDisposable
+
+<header class="top-nav">
+    <div class="brand">Blomster POS</div>
+
+    <time datetime="@_currentTime.ToString("O")">
+        @_currentTime.ToString(
+            "dddd d. MMMM yyyy · HH:mm",
+            _danishCulture)
+    </time>
+</header>