Add dog ruby class

Author: Petros Amiridis

dog.rb

@@ -0,0 +1,15 @@
+class Dog  
+  def initialize(breed, name)  
+    # Instance variables  
+    @breed = breed  
+    @name = name  
+  end
+  
+  def bark
+    puts 'Ruff! Ruff!'
+  end
+  
+  def display
+    puts "I am of #{@breed} breed and my name is #{@name}"
+  end  
+end