As a final task, we want to upload some files using our web application.

• Create a new upload.html form page with a <input type=file …> field (and, ofc., a submit button!);
  • Note: you need to use multipart/form-data form encoding for HTTP file uploading to work.
• Create the appropriate Flask route that serves the upload.html page;
  • Check Flask's ''Request'' object reference for accessing the uploaded files;
• Enhance your route function to save the uploaded file on disk (e.g., the upload/ directory);
• Finally, test it!