resource rest bundle

[dbu]

document the resource rest bundle.

security configuration in resource rest bundle:
the big difference is whitelisting vs blacklisting. The default Symfony security works using blacklisting, while this bundle's security works using whitelisting.

Security is extremely important for this bundle: If not configured correctly, people will have access to the complete CR backend and all data that's stored inside it. That's why I think it's extremely important to not allow any access by default, forcing the developer to think correctly about what and who to allow accessing the API.