create dummy_file.rb for repo language detection

Author: stevenjcumming

dummy_file.rb

@@ -0,0 +1,11 @@
+# dummy_file.rb
+
+# This is a dummy Ruby file used to set the repository's language to Ruby on GitHub.
+
+class Computer
+
+  def say_hello
+    puts "Hello, World!"
+  end
+
+end