Add ch-1 in Ruby

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+# Task 1: Broken Keyboard
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string containing English letters only and also you are given broken keys.
+# Write a script to return the total words in the given sentence can be typed completely.
+# 
+# Example 1
+# Input: $str = 'Hello World', @keys = ('d')
+# Output: 1
+# 
+# With broken key 'd', we can only type the word 'Hello'.
+# 
+# Example 2
+# Input: $str = 'apple banana cherry', @keys = ('a', 'e')
+# Output: 0
+# 
+# Example 3
+# Input: $str = 'Coding is fun', @keys = ()
+# Output: 3
+# 
+# No keys broken.
+# 
+# Example 4
+# Input: $str = 'The Weekly Challenge', @keys = ('a','b')
+# Output: 3
+# 
+# Example 5
+# Input: $str = 'Perl and Python', @keys = ('p')
+# Output: 1
+
+def broken_keyboard(str, keys)
+    words = {}
+    str.split.each { |w| words[w] = 0 }
+    words.each_key do |w|
+        keys.each do |k|
+            if w =~ /#{k}/i
+                words[w] += 1
+                break
+            end
+        end
+    end
+
+    printf "'%s' (%s) -> %d\n", str,
+                                keys.join(', '),
+                                words.select { |_, v| v == 0 }.length
+end
+
+str = 'Hello World'
+keys = ['d']
+broken_keyboard(str, keys)
+
+str = 'apple banana cherry'
+keys = ['a', 'e']
+broken_keyboard(str, keys)
+# 
+str = 'Coding is fun'
+keys = []
+broken_keyboard(str, keys)
+
+str = 'The Weekly Challenge'
+keys = ['a','b']
+broken_keyboard(str, keys)
+
+str = 'Perl and Python'
+keys = ['p']
+broken_keyboard(str, keys)