Added more code

Author: donaldwasserman

demo.cr

@@ -0,0 +1,15 @@
+
+
+class Greeter
+  def initialize(@name : String )
+  end
+
+  def salute
+    puts "Hello #{@name}!"
+  end
+end
+
+g = Greeter.new("world")
+g.salute
+
+