Add editable user profiles

fixes: #5

templates/edit_profile.html

@@ -0,0 +1,21 @@
+{% extends "admin.html" %}
+
+{% block admin %}
+<h1>Profil von {{user.username}}</h1>
+<form action="" method="POST">
+    <div>
+        <label for="username">Benutzername:</label>
+        <input type="text" name="username" value="{{ user.username }}">
+    </div>
+    <div>
+        <label for="email">E-mail:</label>
+        <input type="email" name="email" value="{{ user.email }}">
+    </div>
+    <div>
+        <label for="password">Passwort:</label>
+        <input type="password" name="password" placeholder="Leer lassen um nichts zu ändern">
+    </div>
+    <input type="submit" value="Editieren">
+</form>
+<h2>&nbsp;</h2>
+{% endblock %}