app: add basic flask app

Add a basic Flask "Hello World" as a starting point.

Signed-off-by: Johannes Thumshirn <jth@kernel.org>

app.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+# vim: set sw=4 ts=4 ex
+from flask import Flask, render_template, url_for
+from flask_flatpages import FlatPages
+from datetime import datetime
+
+app = Flask(__name__)
+
+@app.route("/")
+def hello_world():
+    return 'Hello, World!'
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0')

requirements.txt

@@ -0,0 +1,2 @@
+flask
+flask_flatpages