added faker for hiphop artist

doc/music/hiphop.md

@@ -0,0 +1,6 @@
+# Faker::Music::HipHop
+
+```ruby
+Faker::Music::HipHop.artist #=> "Lil Wayne"
+Faker::Music::HipHop.groups #=> "G-Unit"
+Faker::Music::HipHop.subgenres #=> "Alternative"

lib/faker/music/hiphop.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+module Faker
+  class Music
+    class Hiphop < Base
+      class << self
+        ##
+        # Produces the name of a Hip Hop Artist
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Music::Hiphop.artist #=> "Lil Wayne"
+        #
+        # @faker.version next
+        def artist
+          fetch('hiphop.artist')
+        end
+
+        ##
+        # Produces the name of a Hip Hop Group
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Music::Hiphop.groups #=> "OVO"
+        #
+        # @faker.version next
+        def groups
+          fetch('hiphop.groups')
+        end
+
+        ##
+        # Produces the name of a Hip Hop Subgenre
+        #
+        # @return [String]
+        #
+        # @example
+        #   Faker::Music::Hiphop.subgeneres #=> "Alternative"
+        #
+        # @faker.version next
+        def subgenres
+          fetch('hiphop.subgenres')
+        end
+      end
+    end
+  end
+end