take inventory of your books in a google sheet!
this is my second and successful attempt at making a add-book-to-sheets thing (first one)

1. make a netlify account. https://app.netlify.com/signup
2. create a repository using this template. (MAKE SURE TO MAKE IT PRIVATE)
3. go to google sheets and create a new empty sheet.
4. create four columns: ISBN, Name, Author, Pages
5. in your sheet, go to Extensions -> Apps Script
6. you should now have reached a code editor. paste the stuff in AppsScript.gs there
7. Deploy -> New deployment, Select type -> Web app, Description -> anything you want, Execute as -> ME (important), Who has access -> ANYONE (important)
8. then Deploy, give permissions, things like that, don't mind the warning, it's because you're not certified
9. now it should give you a URL. copy that URL and paste it in the SHEETS_WEBHOOK variable in script.js
10. now deploy it to netlify! i'm not explaining how to do that go figure it out yourself
11. in netlify, Project Configuration -> Environment variables
12. set APP_PASSWORD to whatever you want for ALL contexts, don't set it to secret, doesn't work
13. and it should be done! i think. if you encounter any issues please open an issue