* Update free-courses-ru.md

Add three new courses

* Update free-courses-ru.md

Added authors of courses

* Add R section to cheetsheets

Add R Studio section to cheetsheets page

* Add link to RStudio official cheetsheets resources

Resources website: https://www.rstudio.com/resources/cheatsheets

* Add R cheetsheet: Data Wrangling with dplyr, tidyr

Data Wrangling with dplyr and tidyr cheetsheet (U.1/15) english
Public Url: https://www.rstudio.com/wp-content/uploads/2015/02/data-wrangling-cheatsheet.pdf

* Add R cheetsheet: Domar datos con dplyr y tidyr

Data Wrangling with dplyr and tidyr cheetsheet (U.1/15) spanish
Public Url: https://github.com/rstudio/cheatsheets/raw/master/translations/spanish/data-wrangling-cheatsheet_Spanish.pdf
Scrapped from: https://www.rstudio.com/resources/cheatsheets

* Add R cheetsheet: Domar datos con dplyr y tidyr

- Fix CI/CD errors.
- Data Wrangling with dplyr and tidyr cheetsheet (U.1/15) spanish
Public Url: https://github.com/rstudio/cheatsheets/raw/master/translations/spanish/data-wrangling-cheatsheet_Spanish.pdf
Scrapped from: https://www.rstudio.com/resources/cheatsheets

* Add R cheetsheet: Domar datos con dplyr y tidyr

- Fix CI/CD errors
- Data Wrangling with dplyr and tidyr cheetsheet (U.1/15) spanish
Public Url: https://github.com/rstudio/cheatsheets/raw/master/translations/spanish/data-wrangling-cheatsheet_Spanish.pdf
Scrapped from: https://www.rstudio.com/resources/cheatsheets

* Revert RStudio Data Wrangling cheatcheats (KISS)

- Keep It Simple / apply review suggestions. Thus, I remove "Data Wrangling" cheatsheets because it already are present in the RStudio portal that link points to.
- Fix grammar.

* Remove "in process note" of Python Pandas

- Remove the in "process note" in Books - English - Python - Pandas. It always points to last version.

Fixes EbookFoundation/free-programming-books#5431

* Split Python Pandas entry into online+html+pdf

- Split entry at Books - English - Python - Pandas into online+html+pdf

Fixes EbookFoundation/free-programming-books#5431

* Split Python Pandas entry into online+html+pdf

- Fix Pull Request CI/CD errors.
- Split entry at Books - English - Python - Pandas into online+html+pdf

Fixes EbookFoundation/free-programming-books#5431

* Join previous split about Python Pandas book

- Join the previous split entry (online+html+pdf) at "Books - English - Python - Pandas" into one single record

Fixes EbookFoundation/free-programming#5431

* Join previous split about Python Pandas book

- Fix CI/CD errors.
- Join the previous split entry (online+html+pdf) at "Books - English - Python - Pandas" into one single record.

Fixes EbookFoundation/free-programming#5431

* ADD cheetsheet: Pandas Data Wrangling

Add the official Python Pandas Data Wrangling cheetsheet
Source: https://pandas.pydata.org/Pandas_Cheat_Sheet.pdf
Scrapped from: https://pandas.pydata.org/getting_started.html

* ADD cheetsheet: Data Wrangling with pandas

Fix CI- CD error: Alfabetical order

* Add jstrieb/sytems-programming-cheat-sheet

* Swap alphabetical order ("the" matters)

* Updated a Java Course

* Update free-courses-en.md

Cloud Design Patterns link is broken

* Add: new JavaScript book in Japanese

* Add: new C book in Japanese

* Add: new Julia book in Japanese

Co-authored-by: NKatarina <nymphadora96@gmail.com>

* Add Android course (Java)

* Add Android italian course

* Fix blank space error

* My book: Holm School - How to be a computer scientist for Hamiltons a Month (public domain)

* Update free-programming-books.md

* Add Django ebook and Brazilian Interactive Tutorials page

* Code refactoring

* Add author name and access note

* Reorder README 'Interactive Programming Resources' section

* Added more Python resources, updated links/info

* Corrected sorting order

* Removed courses from book list

* Added two Python courses, http to https

* Add Japanese Go books

* Remove Japanese Go books that no longer exists

* add JavaScript online course

* change course to playlist

* change marker
Co-authored-by: NCipher <cipher.team9@protonmail.com>

* Added more Python resources, updated links/info

* Corrected sorting order

* Removed courses from book list

Link was broken and now it's updated.

* Add raytracing in one weekend

* Add html to entry.

* Remove trailing slash

* Add App Inventor category and book

* Fix header level

* Add additional App Inventor book

check_urls=free-programming-books.md

* Switch link to official page for added book

check_urls=free-programming-books.md

* bilisimio android dersleri

* modified and deleted broken links

* deleted blog link

Edit Author's Name Vietnamese
Edit Courses's Name
Add More Courses

* Update free-programming-books-ko.md

* Remove trailling slash

* Update free-programming-books.md

* Update free-programming-books.md

* Add Some Arabic Courses

* make travis happy

* fixed last travis issues

* change titles