Add Reverse String (#1623)

* Add auto-generated files
* Add real code
* Rubocop
* Fix configlet
* Layout/TrailingEmptyLines: Corrected
* Fix file paths

---------

Co-authored-by: KOTP <[email protected]>

exercises/practice/reverse-string/.docs/instructions.md

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+# Instructions
+
+Your task is to reverse a given string.
+
+Some examples:
+
+- Turn `"stressed"` into `"desserts"`.
+- Turn `"strops"` into `"sports"`.
+- Turn `"racecar"` into `"racecar"`.

exercises/practice/reverse-string/.docs/introduction.md

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+# Introduction
+
+Reversing strings (reading them from right to left, rather than from left to right) is a surprisingly common task in programming.
+
+For example, in bioinformatics, reversing the sequence of DNA or RNA strings is often important for various analyses, such as finding complementary strands or identifying palindromic sequences that have biological significance.

exercises/practice/reverse-string/.meta/config.json

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+{
+  "authors": [
+    "iHiD", "erikSchierboom"
+  ],
+  "files": {
+    "solution": [
+      "reverser.rb"
+    ],
+    "test": [
+      "reverse_string_test.rb"
+    ],
+    "example": [
+      ".meta/example.rb"
+    ]
+  },
+  "blurb": "Reverse a given string.",
+  "source": "Introductory challenge to reverse an input string",
+  "source_url": "https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb"
+}

exercises/practice/reverse-string/.meta/example.rb

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+module Reverser
+  def self.reverse(input)
+    input.reverse
+  end
+end

exercises/practice/reverse-string/.meta/tests.toml

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+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[c3b7d806-dced-49ee-8543-933fd1719b1c]
+description = "an empty string"
+
+[01ebf55b-bebb-414e-9dec-06f7bb0bee3c]
+description = "a word"
+
+[0f7c07e4-efd1-4aaa-a07a-90b49ce0b746]
+description = "a capitalized word"
+
+[71854b9c-f200-4469-9f5c-1e8e5eff5614]
+description = "a sentence with punctuation"
+
+[1f8ed2f3-56f3-459b-8f3e-6d8d654a1f6c]
+description = "a palindrome"
+
+[b9e7dec1-c6df-40bd-9fa3-cd7ded010c4c]
+description = "an even-sized word"

exercises/practice/reverse-string/reverse_string_test.rb

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+require 'minitest/autorun'
+require_relative 'reverser'
+
+class ReverserTest < Minitest::Test
+  def test_an_empty_string
+    # skip
+    assert_equal "", Reverser.reverse("")
+  end
+
+  def test_a_word
+    skip
+    assert_equal "tobor", Reverser.reverse("robot")
+  end
+
+  def test_a_capitalized_word
+    skip
+    assert_equal "nemaR", Reverser.reverse("Ramen")
+  end
+
+  def test_a_sentence_with_punctuation
+    skip
+    assert_equal "!yrgnuh m'I", Reverser.reverse("I'm hungry!")
+  end
+
+  def test_a_palindrome
+    skip
+    assert_equal "racecar", Reverser.reverse("racecar")
+  end
+
+  def test_an_even_sized_word
+    skip
+    assert_equal "reward", Reverser.reverse("drawer")
+  end
+end

exercises/practice/reverse-string/reverser.rb

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+=begin
+Write your code for the 'Reverse String' exercise in this file. Make the tests in
+`reverse_string_test.rb` pass.
+
+To get started with TDD, see the `README.md` file in your
+`ruby/reverse-string` directory.
+=end