Reads data, validate from a google sheet database with usernames, user e-mails and user IDs.
[ ] 1. Code.gs = Server side code
[ ] 2. usf.html = GUI application
[ ] 3. usf-css.html = Visual effects
[ ] 4. usf-js.html = JavaScript functionality
[ ] 5. macros.gs = Actions in the google spreadsheet
[ ] 6. outPage.html = Landing page on {"Success"}
[ ] 7. errorPage.html = Landing page on {"Error"}
[ ] 8. UserformResponse (Google sheets) | Sheets = [Data, Users]
[ ] 9. Responses (Google Drive Folder)