Update readme

README.md

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 Usage examples
 
- - https://github.com/sonata-project/SonataMediaBundle
- - https://github.com/sonata-project/SonataNewsBundle
+ - https://github.com/sonata-project/SonataMediaBundle : a media manager bundle
+ - https://github.com/sonata-project/SonataNewsBundle : a news/blog bundle
+ - https://github.com/sonata-project/SonataPageBundle : a page (CMS like) bundle
  - https://github.com/sonata-project/SonataUserBundle (integration of FOSUserBundle and SonataAdminBundle)
 
 TODO