Added Room and some little design updates

app/views/rooms/new.html.erb

@@ -0,0 +1,12 @@
+<% content_for :title, "Neuen Raum hinzufügen" %>
+
+<% content_for :top_bar_actions do %>
+  <%= link_to rooms_path, class: "py-2 px-3 text-sm font-medium text-gray-700 bg-white border border-gray-300 rounded-lg hover:bg-gray-50 flex items-center gap-1.5 shadow-sm transition" do %>
+    <svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" d="M10.5 19.5L3 12m0 0l7.5-7.5M3 12h18" /></svg>
+    Zurück zur Übersicht
+  <% end %>
+<% end %>
+
+<div class="p-4 md:p-6">
+  <%= render "form", room: @room %>
+</div>