* Remove `CODE_OF_CONDUCT.adoc` if favor of the same for a GitHub org
* Move `LICENSE.txt` to the root project dir
* Fix `build.gradle` to copy a `LICENSE.txt` from the actual location
* Fix `README.md` and `CONTRIBUTING.adoc` to point into the actual `CODE_OF_CONDUCT`
& Security policy
* Add `ISSUE_TEMPLATE` directory with files similar to ones in `spring-session`
* Fix wrong section `id` in the `whats-new.adoc`
