* Add Java

Add java section and book

* Update Java

Update name and link

* Update java

update link for java

* Update java

* Update free-courses-id.md

Added recourse(s)

* Fixed Formatiing

I hope

* Add Playground Reference Site for Dart & Flutter

* fix format

* Fix url dartpad.dev format

* Fix lint

* Updated language names with native language names.

All the languages were only present in English, So I added the native language alongside it for better readability.

* Rearranged Indonesian course

Indonesian course was not alphabetically arranged, so sorted that in alphabetical order.

* Update free-courses-id.md

* Update free-courses-id.md

* update ebook link of dasar pemrograman golang

* Update free-programming-books-id.md

* add ebook author name on dasar pemrograman golang

* Update free-programming-books.md

* Add web book for making SVG's

* Add ML-related book

* Add another ML book

* Add yet another ML book

* add courses Kotlin and Go

* add courses Go and Kotlin

* Add "The Ruby Reference" book

* Delete "The Ruby Reference" book contributors link

Update dead link of 3 courses to newer versions of the same courses.
It is the same author.

* Update HTML CSS in free-programming-books-id

* Add Android free-programming-books-id

* Update Android ebook in free-programming-books-id

* Update free-programming-books-id.md

Add one

* Update free-programming-books-id.md

* Update free-programming-books-id.md

* Update free-programming-books-id.md

* Update free-programming-books-id.md
Co-authored-by: Nandreasjp0 <andreasjp0@github.com>

* Update free-programming-books-id.md

* Update free-programming-books-id.md

* Update free-courses-en.md

Updated tutorials for Java, R, SQL

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* add: kubernetes and docker play grounds

* fix: sorting in alphabetical order

* fix: remove trailing slash

* Create free-courses-id.md

* Update free-courses-id.md

* Update free-courses-id.md

* Update free-courses-id.md

* Update free-courses-id.md

* Update free-courses-id.md

* Update free-courses-id.md

* Update free-courses-id.md

* Added a link that leads to free-courses-id.md

* Update free-courses-id.md

add Tutorial Git in Bahasa Indonesia

* added cp sites

* removed trailing slash from toph url

* add Tutorial Python in Bahasa Indonesia

* add tutorial python in bahasa indonesia and fix error

* fix blank line

* add machine learning course in bahasa indonesia

* Update free-courses-pt_BR.md

* list alphabetized

Co-authored-by: NYehezkiel Gunawan <yehezkiel.gunawan@codify.id>

* Update free-programming-books-id.md

Hacktoberfest 2020

* Update free-programming-books-id.md

Fixed the link of "A MINDSTORMS EV3 robotok programozásának alapjai" to https://hdidakt.hu/wp-content/uploads/2016/01/dw_74.pdf

Co-authored-by: NStephan Schuberth <stephan.schuberth@de-cix.net>

* add more books and fix some old links

* fix some travis tests

* fix links

* try to fix the unicode order for Travis tests

* fix unicode order for Travis tests

* fix the unicode order for Travis tests 2

* fix unicode order for Travis tests 3

* fix unicode order for Travis tests 4

* fix unicode order for Travis tests 5

* Update kotlin playground

The current kotlin playground is obsolete.
Updated to the new playground link.

* remove '/' to satisfy linter

Always check the Travis-CI output!
Co-authored-by: NEric Hellman <eric@hellman.net>

* improvements to check_urls

make check have a more descriptive name
produce output file instead

* upload artifacts

* a

* change file to trigger test

* put things back

* Updated with refined link

* hope this space works