add new book

[0rigin-c0de]

hey please add You-Dont-Know-JS book for javascript

[Susmita-Dey]

Hey @0rigin-c0de Feel free to create a PR for this issue

[Himanshuch8055]

I have the book "You Don't Know JS". My question is how to add it to a website since it's in PDF format and make a PR. @Susmita-Dey @0rigin-c0de