Initial data commit

Task/Inheritance-Single/Ruby/inheritance-single.rb

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+class Animal
+  #functions go here...
+  def self.inherited(subclass)
+    puts "new subclass of #{self}: #{subclass}"
+  end
+end
+
+class Dog < Animal
+  #functions go here...
+end
+
+class Cat < Animal
+  #functions go here...
+end
+
+class Lab < Dog
+  #functions go here...
+end
+
+class Collie < Dog
+  #functions go here...
+end