implement user and login

templates/login.html

@@ -16,7 +16,7 @@
         <input type="text" placeholder="Username" id="usrnm">
         <input type="password" placeholder="Passwort" id="pw">
         <button id="login-btn">Login</button>
-        <button>Erstelle Nutzer</button>
+        <button id="create-btn">Erstelle Nutzer</button>
     </div>
 
     <script src="{{ url_for('static', filename='login.js') }}"></script>