Implement hello-world in ruby

ruby/hello-world/HELP.md

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+# Help
+
+## Running the tests
+
+For running the tests provided, you will need the Minitest gem. Open a
+terminal window and run the following command to install minitest:
+
+```
+gem install minitest
+```
+
+
+Run the tests from the exercise directory using the following command:
+
+```
+ruby <snake-case-exercise>_test.rb
+```
+
+Please replace `<snake-case-exercise>` with your exercise name in snake_case.
+
+## Color output
+
+You can `require 'minitest/pride'` or run the following command to get colored output:
+
+```
+ruby -r minitest/pride <snake-case-exercise>_test.rb
+```
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit hello_world.rb` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Ruby track's documentation](https://exercism.org/docs/tracks/ruby)
+- The [Ruby track's programming category on the forum](https://forum.exercism.org/c/programming/ruby)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [Ruby Documentation](http://ruby-doc.org/)
+- [StackOverflow](http://stackoverflow.com/questions/tagged/ruby)
+- [/r/ruby](https://www.reddit.com/r/ruby) is the Ruby subreddit.

ruby/hello-world/README.md

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+# Hello World
+
+Welcome to Hello World on Exercism's Ruby Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+The classical introductory exercise.
+Just say "Hello, World!".
+
+["Hello, World!"][hello-world] is the traditional first program for beginning programming in a new language or environment.
+
+The objectives are simple:
+
+- Modify the provided code so that it produces the string "Hello, World!".
+- Run the test suite and make sure that it succeeds.
+- Submit your solution and check it at the website.
+
+If everything goes well, you will be ready to fetch your first real exercise.
+
+[hello-world]: https://en.wikipedia.org/wiki/%22Hello,_world!%22_program
+
+## Source
+
+### Created by
+
+- @ramonh
+
+### Contributed to by
+
+- @abartov
+- @bgrabow
+- @budmc29
+- @gilmatic
+- @hilary
+- @iHiD
+- @Insti
+- @jpotts244
+- @Kosmas
+- @kotp
+- @kytrinyx
+- @mike-hewitson
+- @NeimadTL
+- @sivabudh
+- @skeskali
+- @thejoycekung
+- @trayo
+- @tryantwit
+
+### Based on
+
+This is an exercise to introduce users to using Exercism - https://en.wikipedia.org/wiki/%22Hello,_world!%22_program

ruby/hello-world/hello_world.rb

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+class HelloWorld
+  def self.hello
+    "Hello, World!"
+  end
+end

ruby/hello-world/hello_world_test.rb

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+require 'minitest/autorun'
+require_relative 'hello_world'
+
+class HelloWorldTest < Minitest::Test
+  def test_say_hi
+    # skip
+    assert_equal "Hello, World!", HelloWorld.hello
+  end
+end