* 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

* 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!!

* Added Portuguese and Italian Translations.

Added Portuguese and Italian Translations of the book Python For Everybody by Dr. Charles Russell Severance

* Update free-programming-books.md

Updated the link to the latest edition.

* Update free-programming-books.md

Updated edition for the book with author and links in three places.

* Update free-programming-books.md

Added Think DSP - Digital Signal Processing in Python.

* Update free-programming-books.md

Added Think Data Structures: Algorithms and Information Retrieval in Java.

* Update free-programming-books.md

Added two new books;
Think C++: How To Think Like a Computer Scientist
Modeling and Simulation in Python

* Minor changes to adhere to Contributing.md

Thanks to @kashirash
Suggested edits to pass travis-ci and respecting markdown formatting.

* 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

Written by Massimiliano Tarquini and Alessandro Ligi

* added italian free book - Immersione in Python 3

* fixed alphabetical order

* remove-dead-links

remove dead urls (404's) and sections that no longer contain resources

* remove one more dead link

Remove an additional link that resolved, but contained no information

* remove indexes with no links

* Add Italian C/C++ resources

* Update free-programming-books-it.md

Fix TravisCI error

* Remove broken links in Italian books

* Add Italian Perl resources

* Add year of pubblication of the Perl course

* Update free programming books it

* UPDATE free-programming-books in italian

* Added year of pubblication of the js course

* Update year of pubblication in italian

* Added author to js course

* Removed trailing slash from URL

* Update README

* Update Readme with CC BY licence

* DRY: link to LICENSE.md, not to CC. also spelling

* Add Italian database free books

* Add Italian MySQL guide

* Add Italian Database resources

* Update free-programming-books-it.md

Fix Travis error

* Add Italian guides for Java - Android - PHP

* Update free-programming-books-it.md

Fix Travis errors

* Update free-courses-it.md

* Update free-programming-books-it.md

Add Analisi e progettazione del software

* Update free-programming-books-it.md

Add UML section

* remove non-book

* Update free-programming-books-it.md

Add some books about "Algoritmi e Strutture Dati"

* Update free-courses-en.md

Add Ambient Intelligence course

* Update free-programming-books-it.md

Add Introduzione alle Espressioni regolari

* add spaces to satisfy linter

* 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 added Java version of Java Wikibook, by checking the edits history.