* Add Math Books from aimath.org

* Fix Trailing Slashes

* Fix Alphabetical Order?

* Fix Alphabetical Order

* Fixed language and categories

* Fixed language and categories for -ko.md

* Removed most PDF links from addition.

* Replace German Resource with Direct Link to PDF

* reorganize files

1. make it easier to find files
2. reduce scrolling to get to README on main view of repo

* remove tr.txt again

* Update German Book List

* fix Kühnel Name

* Update German git

* - add https link
- add Book authors

* change [] to ()

* Beej's Guide to Network Programming - Using Internet Sockets

Added 9 translations:
Chinese
French
German
Italian
Korean
Brazilian Portuguese
Polish
Russian
Turkish

* Beej's Guide to Python Programming For Beginners

Added translations:
English

* Beej's Guide to Unix Interprocess Communication

Added Translations:
English

* Beej's Guide to C Programming

Adding formats.

* Beej's Guide to the GNU Debugger (GDB)

Added translations:
English
Russian

* Added translator names to the books.

Added Translator name for:
German
Italian
Polish
Brazilian Portuguese
Russian
Turkish
Chinese
No translator name found:
French
Korean

* Added author along with the translation!!

* Add "A byte of Python"

* Move link up for correct order

* Update link to source

* Add german source again

* Delete dead links

* Add React book in German

* add Author

* Fix linting error
Co-authored-by: NLukas Kleybolte <lukas.kleybolte@hs-augsburg.de>

* Added two new books check_urls=free-programming-books-de.md

* Removed source as it is not a Book

* Update free-programming-books-de.md

* Update free-programming-books-de.md

Removed the 0

* Update free-programming-books-de.md

* 20201018

* 20201018b

* Add "Symfony 5: The Fast Track" book (en)

* Add "Symfony 5: The Fast Track" book (es)

* Add "Symfony 5: The Fast Track" book (de)

* Add "Symfony 5: The Fast Track" book (ar)

* Add "Symfony 5: The Fast Track" book (fa)

* Add "Symfony 5: The Fast Track" book (ja)

* Add "Symfony 5: The Fast Track" book (ru)

* Add "Symfony 5: The Fast Track" book (it)

* Add "Symfony 5: The Fast Track" book (nl)

* Add "Symfony 5: The Fast Track" book (pl)

* Add "Symfony 5: The Fast Track" book (pt_BR)

* Add "Symfony 5: The Fast Track" book (ro)

* Add "Symfony 5: The Fast Track" book (zh_CN)

* Add "Symfony 5: The Fast Track" book (fr)

* Remove redundant line breaks

* Updated Link from Pro Git to new book version

* Update free-programming-books-de.md

* Update free-programming-books-de.md

* Adding Harvard GSE Scratch Book

* Adding foreign language for scratch guide from harvard graduate school of edu

* linting

* remove broken links

* remove broken links

* remove broken links

* fix broken links

* fix broken links

* fix broken links

* fix broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* remove broken links

* replace dead link

i after g!