I have a stable opensource library and was wondering how (and if) I can publish my lib to maven official repositories so people can include it in their pom.xml
file
If you want reliable access for everyone out there, you need to stick with central. Due to the tendency of people at dev.java.net to break rules about the immutability of released artifacts, some people don't trust it. Further, it can be Very Slow.
To get your project into central, you need have your code in some public repo that they can sync from.
The process to get your library in the central repostiory is documented in the Guide to uploading artifacts to the Central Repository. In short, the new process is to get your project hosted by one of the approved Forges that will be synced with central, the Maven folks don't rsync personal repository anymore. In your case, your best bet would be to use the Sonatype Forge (open to any OSS Project). Check the given link (and also this document).