add frontend angular

frontend/src/app/app.html

@@ -0,0 +1,25 @@
+<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
+<!-- * * * * * * * * * * * The content below * * * * * * * * * * * -->
+<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
+<!-- * * * * * * * * * * and can be replaced.  * * * * * * * * * * -->
+<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
+<!-- * * * * * * * * * Delete the template below * * * * * * * * * -->
+<!-- * * * * * * * to get started with your project! * * * * * * * -->
+<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
+
+<style>
+
+</style>
+
+<main class="main">
+  <div class="content">
+
+    <header>
+    <h1>OEDB</h1>
+      <button class="login">login OSM</button>
+    </header>
+    <main>
+    <router-outlet/>
+    </main>
+  </div>
+</main>