move demo documents into separate files

demo/docs/ruby.rb

@@ -0,0 +1,12 @@
+#!/usr/bin/ruby
+
+# Program to find the factorial of a number
+def fact(n)
+    if n == 0
+        1
+    else
+        n * fact(n-1)
+    end
+end
+
+puts fact(ARGV[0].to_i)