Initial project setup with Flask, including main application file, requirements, and basic HTML template.

app/main.py

@@ -0,0 +1,12 @@
+from flask import Flask
+
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello_world():
+    return "<p>Hello, World!</p>"
+
+if __name__ == "__main__":
+    app.run()