* Learn Ruby

Added a Ruby online material for learning

* Formatting updated

I formatted the contribution by fixing the alphabetical order of my Learn Ruby tutorial.

Added in 1 free programming course:
* [Introdução ao Kubernetes no Azure](https://docs.microsoft.com/pt-br/learn/paths/intro-to-kubernetes-on-azure/)

by Dr. Charles Severance (University of Michigan)

Added a new Python programming tutorial

* feat: translate CONTRIBUTING doc into zh-TW version

* feat: add link to other CONTRIBUTING

Added a new Python tutorial

Added a new PHP tutorial

Added a link to HOWTO-hi.md.

Added link to HOWTO-hi.md.

* Add Resource(s) & Books

* Add in-progress indicator
Co-authored-by: NARSAN <arsandev@users.noreply.github.com>

* Added books.

* Added a PDF annotation.

* Removed trailing slash.

* Removed some things because of Travis CI warnings.

* Update free-programming-books-ta.md

* Added construction in process.

* Update free-courses-en.md

* Update free-courses-en.md

* add link Python para Competições de Programação in courses pt_BR

* fix number of blank lines and add pdf indicator

added HOWTO.md in Hindi language

* Added ANSI C books

* Update free-programming-books-bg.md

* Update free-programming-books-bg.md

I have added a new course on Databases - DML Statements and SQL Server Administration.

* Add Shape Up by Basecamp's Ryan Singer

* Update formatting of Shape Up entry

Added link of HOWTO-zh.md .
**This file is in PR right now, please consider it

* Created HOWTO-zh.md

HOWTO-zh.md in Chinese

* Update HOWTO-zh.md

* Added books and book lists.

* Moved meta-list to a section.

* Moved book from Smalltalk to Scratch.

* Added alphabetical order.

* Removed the list.

* Update free-programming-books-ta.md

* Update free-programming-books.md

* Update free-programming-books-ta.md

* Add arabic book

* mark link as PDF

* Add a textbook introducing emacs driven text editing

* Add a newline to match formatting

* Change ordering of tutorials to be alphabetical

- add Mostly Adequate Guide to FP

Python 3 book from DigitalOcean.

* Add Neo4j books

* Add book format

* Add authors