To make it into integrated plugins you need to make a MR with your plugin in the same place in the code as all other plugins and it’s best if you checked if it works after you compile it (I believe you have a Krita dev environment, right?).
@raghukamath however suggested that you could just add it to the Resources Page: https://docs.krita.org/en/resources_page.html and there is instruction here: About the Plugins category - it’s basically the same thing, but instead of MR to Krita’s code, you need to make MR to Krita Manual text.