Update cli.rst

Add cement to cli frameworks

docs/scenarios/cli.rst

@@ -62,3 +62,13 @@ subcommands, output formatters, and other extensions. The framework is meant
 to be used to create multi-level commands such as subversion and git, where
 the main program handles some basic argument parsing and then invokes a
 sub-command to do the work.
+
+Cement
+------
+
+`Cement <http://builtoncement.com/>`_ is an advanced CLI Application Framework. 
+Its goal is to introduce a standard, and feature-full platform
+for both simple and complex command line applications as well
+as support rapid development needs without sacrificing quality. 
+Cement is flexible, and it's use cases span from the simplicity of a micro-framework 
+to the complexity of a meg-framework.