Add missing templates

templates/login.html

@@ -0,0 +1,15 @@
+{% extends "base.html" %}
+{% block title %}Login – PBT{% endblock %}
+{% block content %}
+  <h2>Login</h2>
+  <form method="post">
+    <label for="username">Benutzername</label>
+    <input type="text" id="username" name="username" required autofocus>
+
+    <label for="password">Passwort</label>
+    <input type="password" id="password" name="password" required>
+
+    <button type="submit">Einloggen</button>
+  </form>
+  <p>Noch kein Konto? <a href="{{ url_for('register') }}">Jetzt registrieren</a></p>
+{% endblock %}