Added "30 Days Of Vue" Book (#5267)

* Added 30 Days Of Vue Book

* access note for PDF

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books.md

@@ -1941,6 +1941,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 #### Vue.js
 
+* [30 Days Of Vue](https://www.newline.co/30-days-of-vue) - Hassan Djirdeh (HTML; *email required for PDF*)
 * [Learning Vue.js](https://riptutorial.com/Download/vue-js.pdf) (PDF)
 * [The Vue.js Handbook](https://flaviocopes.nyc3.digitaloceanspaces.com/vue-handbook/vue-handbook.pdf) - Flavio Copes (PDF)