Hey @Osama!
Sorry for the late reply, I’ve been pretty busy lately!
I’ll definitely look into opening a PR. I made things a little more complicated for myself by downloading the official plugin as a ZIP and working directly from that instead of properly forking the repository 
I’ll need to take some time to compare the changes and make sure the PR is clean, but I don’t think it should be too difficult.
In any case, I’ve already deployed the integration on my own Discourse forum, and it’s working perfectly so far! Listmonk’s API is really clear and intuitive, which made the integration fairly straightforward.
Thanks for taking the time to look at it and for being open to merging it!