Could you add a git source repository (or some other source control tool) so that we can fork the code and create pull requests?

A suggestion of a website you could use to create a Git repository is Github.

I can understand why you want me to add the code to github. But this is a small mod and I don't want to have to update the code on several places just to update the it. If there's a way to sync the github and modportal automatically please tell me and I'll add a git, but if there isn't an automatic way I'm probably not going to add it to git.

Yeah, I guess it doesn't really make sense to have git for a project this small.
Git isn't that hard once you've learnt how to use it, and things like visual studio code will interface with it, but I don't think there is a way to sync github and the mod portal, and it might be too complex for anyone to add in without a lot of requests.