Prepare documentation for release 3.0

[vladimir-bukhtoyarov]

Create monitoring manifest

Describe the key principles behind the rolling-metrics library.

Mostly, it should be the simpler and shorter copy of:

• http://stuff-gil-says.blogspot.ru/2014/11/writerreaderphaser-story-about-new.html
• https://github.com/marshallpierce/metrics-thoughts

Also it is need to add special notes about predictable retention.

Document all retention policies

Both wiki and javadocs

Document Dropwizard metrics integration

Both wiki and javadocs

Document Eclipse microprofile metrics integration

Both wiki and javadocs