Added simple web page, routes are in a separate file

templates/index.html

@@ -0,0 +1,12 @@
+{% extends "base.html" %}
+
+{% block title %}Main page{% endblock %}
+
+{% block content %}
+    <h1>
+        This is the default main page of
+        <a href="https://git.dc09.ru/DarkCat09/tmpl-flask">
+            Flask app template
+        </a>
+    </h1>
+{% endblock %}