docs(core): add info about nexus staging repository to releasing guide

Co-authored-by: Timon Back <timonback@users.noreply.github.com>

RELEASING.md

@@ -13,6 +13,9 @@ The following list describe the steps necessary to release a new version.
 3. Update `all-contributors` in [README.md](README.md)
 4. Remove the `-SNAPHSOT` postfix in `.env`, create a new branch `release/0.X.X` (version number), commit & push
 5. Run GitHub `Publish releases` pipeline from the newly created release branch
+   1. The stage artifacts can be viewed in https://s01.oss.sonatype.org/#view-repositories
+   2. To view them, select `Nexus Managed Repositories` in the drop-down and search for springwolf in the searchbox 
 6. Release version in nexus
+   1. Artifacts are visible in the public maven repository: https://repo1.maven.org/maven2/io/github/springwolf/
 7. Update version number on website
 8. Update the version number in `.env` for next snapshot on branch `master`, commit & push