Added JavaScript Interview #35 book. (#5324)

* Added JavaScript Interview #35 book.

* Added email address requested, not required note.

books/free-programming-books.md

@@ -1760,6 +1760,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [JavaScript for Impatient Programmers (ES2020 edition)](https://exploringjs.com/impatient-js/toc.html) - Dr. Axel Rauschmayer (HTML)
 * [JavaScript Fundamentals, Plus a Dash Of JQuery - for dinner ladies](http://nicholasjohnson.com/javascript-book/) - Nicholas Johnson (HTML)
 * [JavaScript Garden](http://bonsaiden.github.io/JavaScript-Garden/) Maintained by Tim Ruffles (HTML)
+* [JavaScript Interview #35](https://gumroad.com/l/javascript-interview-35) - Coderslang Master (PDF, email address *requested*, not required)
 * [JavaScript Notes for Professionals](https://goalkicker.com/JavaScriptBook/) - Compiled from StackOverflow documentation (PDF)
 * [JavaScript Patterns Collection](http://shichuan.github.io/javascript-patterns/) - Shi Chuan (HTML)
 * [JavaScript Spessore](https://web.archive.org/web/20160325064800/https://leanpub.com/javascript-spessore/read) - Reginald Braithwaite (HTML)