Provide labels and milestones to get more/better support by community

[jbellmann]

Summary

For the community / users of this library it's not clear where help/support is needed and what's the roadmap for this project.

Many pull-requests are still open for too long. So the question is: Is this project still active in some way? What's the future of this library? What's planned by spring team? Will it be replaced with the new oauth2 support in spring-boot-2?

If there is some help needed let us know. Some lines written into the README (or another file of course) would be great. Labels / Milestones and detailed plan would be awesome.

Regards,
Jörg