Add initial Flask application and requirements file

app.py

@@ -0,0 +1,10 @@
+from flask import Flask
+
+app = Flask(__name__)
+
+@app.route('/')
+def index():
+    return "Hello, World!"
+
+if __name__ == '__main__':
+    app.run(debug=True, host='127.0.0.1', port=5000)

requirements.txt

@@ -0,0 +1,7 @@
+blinker==1.9.0
+click==8.2.1
+Flask==3.1.1
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.2
+Werkzeug==3.1.3