Add RocketGit

Include an entry for the RocketGit project:

    http://rocketgit.com

The new entry is placed on the 'Web Applications' subgroup from the
'Software' category.

Signed-off-by: Carlos Torres <torr.ca@mailgw.com>

README.md

 * [PHP Queue](https://github.com/CoderKungfu/php-queue) - An application for managing queueing backends.
 * [phpRedisAdmin](https://github.com/ErikDubbelboer/phpRedisAdmin) - A simple web interface to manage [Redis](https://redis.io/) databases.
 * [PHPSandbox](https://phpsandbox.io) - An online IDE for PHP in the browser.
+* [RocketGit](http://rocketgit.com) - FOSS Git hosting platform with webhooks, anonpush, zero Javascript and more.
 
 ### Infrastructure
 *Infrastructure for providing PHP applications and services.*