README.md contains a broken link to the contributing doc (hacking WildFly doc):

https://developer.jboss.org/wiki/HackingOnWildFly

the above link is no longer valid.

The above link points to an external doc, which always lags behind the repository version. So I suggest that the contributing doc points to a doc inside the repo via relative link.

The Hacking doc inside the repo (https://github.com/wildfly/wildfly/blob/main/docs/src/main/asciidoc/Hacking_On_WildFly.adoc) contains the links to its 3 sub-sections, which are all sizable reading. It might be better to directly create 3 links under README.md contributing section, each pointing to a hacking_*.adoc. For example,

• Contributing
  • Git setup
  • Contributing
  • Pull request standard

Also need to update the jdk and java version from 8+ to 11+. Also check jdk versions in the 3 hacking adoc.