Add initial Flask application and update README with setup instructions

README.md

@@ -1,2 +1,5 @@
 # website-backend
 
+Run pip install -r requirements.txt to install the necessary dependencies.
+
+Run python app.py to start the backend server for the website.

app.py

@@ -0,0 +1,10 @@
+from flask import Flask
+
+app = Flask(__name__)
+
+@app.route("/")
+def hello_world():
+    return "<p>Hello, World!</p>"
+
+if __name__ == "__main__":
+    app.run(debug=True)

requirements.txt

@@ -0,0 +1 @@
+flask~=3.1.2