Add spring-cloud project

* [x] add spring cloud in the data fixtures
* [x] add spring cloud on the projects page
* [x] make sure the dedicated GitHub page for spring-cloud works before pushing to production

------
 
* [x] @ramnivas to provide text for project summary (see https://spring.io/projects ).
* [x] @ramnivas to take a look at [spring projects gh-pages readme](https://github.com/spring-projects/gh-pages) and start one for the spring-cloud project