* New AI course

* New Finnish AI course

* Elements of AI course in German

* Trailing slash fix

* Trailing slash fix

* Added Intro to Machine Learning course by Udacity

* Changed ordering of courses in Machine Learning section

* add udacity note

* updating Microsoft's python course link

* fix link

* Update free-courses-en.md

* Update free-courses-en.md

* Updated PHP courses

Removed: 
Ultimate PHP Basics for Absolute Beginners - no longer free

Added:
beginners course PHP Programming Language Tutorial - Full Course and more advanced course Laravel 5.8 Tutorial From Scratch

* PHP Courses added

Corrected order

* Added PHP courses

Two PHP courses added and one removed (no longer free)

This reverts commit 4a9f06b4.

* added free react and grapQL courses

* updated the link to react course

* added required spacing

* Update deprecated links to Google's Android courses

* Renaming link to codelab in alphabetical order

* Rearrange in alphabetical order

* Remove Android Developer Fundamentals from books

* Add Android Developer Fundamentals to courses list

Course is depreciated

* Add Intro to JavaScript ES6 programming

* fix lint

* fix lint

* fix introducing to es6 to playlist link

* add GitHowTo

* fix lint

Pattern Recognition and Machine Learning Book Added from Microsoft

* Added  Edx Machine Learning course by Microsoft

* Added Edx Machine Learning course by Microsoft

* Update free-courses-en.md

* Update free-courses-en.md

* delint

* added Solidity

* added Solidity

* added Solidity

* bitcoin book added

* fixed ordering on bitcoin book entry

* added authors for bitcoin and solidity books

* added Bitcoin and cryptocurrency Princeton book

* mooc.fi Java courses added

* Added Git and Github course

* Ordering the list alphabetically

* Add Swift Vapor resources

* Reorder Vapor resources alphabetically

* Add author to Vapor 3 tutorial

* Move vapor university to free-courses-en.md

* Update free-courses-en.md

Added C++ courses on edX.org

* Update free-courses-en.md

Corrected alphabetical order.

* added Go Tour by golang.org

* added A Tour of Go by golang.org

* Added Codename One books

Codename One is an Open Source Java platform for mobile devices (iOS, Android, Windows etc.). The developer guide is created in the open as part of the Codename One wiki. The Uber Clone book isn't free but the first 2 chapters which are about 100 pages are free to download without an email address or anything. I hope the latter is considered free enough for this list

* Fixed typo in book name and added author

* Attempt to fix lint issues

* Added free course

* Fixed location of (PDF) next to author

* added '(first 2 chapters)' to the title