Add menu to choose what Affinity app to install

[ryzendew]

`# Display menu
echo "Select the application you want to install:"
echo "1) Affinity Photo"
echo "2) Affinity Designer"
echo "3) Affinity Publisher"
echo "4) Exit"
read -p "Enter your choice: " choice

Perform the appropriate installation based on user choice

case $choice in
1) install_affinity_photo ;;
2) install_affinity_designer ;;
3) install_affinity_publisher ;;
4) exit 0 ;;
*) echo "Invalid choice." ;;
esac`