Add remove vowels challenge

DIRECTORY.md

@@ -14,6 +14,7 @@
     * [Get Products Of All Other Elements](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/get_products_of_all_other_elements.rb)
     * [Jewels And Stones](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/jewels_and_stones.rb)
     * [Remove Elements](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/remove_elements.rb)
+    * [Remove Vowels](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/remove_vowels.rb)
     * [Single Number](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/single_number.rb)
     * [Sort Squares Of An Array](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/sort_squares_of_an_array.rb)
     * [Two Sum](https://github.com/TheAlgorithms/Ruby/blob/master/data_structures/arrays/two_sum.rb)

data_structures/arrays/remove_vowels.rb

@@ -0,0 +1,29 @@
+# Challenge name: Remove vowels from a string
+#
+# Given a string s, remove the vowels 'a', 'e', 'i', 'o', and 'u'
+# from it, and return the new string.
+# Example 1:
+# Input: s = "leetcodeisacommunityforcoders"
+# Output: "ltcdscmmntyfrcdrs"
+#
+# Example 2:
+# Input: s = "aeiou"
+# Output: ""
+#
+# @param {String} s
+# @return {String}
+
+#
+# Approach 1:
+#
+# Time Complexity:
+#
+def remove_vowels(s)
+end
+
+s = 'leetcodeisacommunityforcoders'
+print(remove_vowels(s))
+# => "ltcdscmmntyfrcdrs"
+s = 'aeiou'
+print(remove_vowels(s))
+# => ""