MAINTAINERS.MD: Add @schneiderl as contributor

[schneiderl]

Just added myself as collaborator on Maintainers.md

Closes #2898

[mebeim]

I'd rather say "Add @schneiderl as contributor" since it's an addition rather than an a role change. Also you lost a newline there, let's keep the formatting consistent, shall we? Oh, and by the way: welcome aboard! 😄 🎉

[schneiderl]

@mebeim made the necessary changes :)

[waldyrious]

@schneiderl please keep the double lines before level-2 headings 😊

[mebeim]

@waldyrious they are kept. GitHub displays the diff in a weird way, but there still are two lines before the next heading.

By the way @schneiderl with my previous comment I was talking more about the commit message than the title of the PR 😅, that's what is going to be in the history. I'm approving anyway since it can be changed when we squash-merge this so it's not really a big problem.

[waldyrious]

@waldyrious they are kept. GitHub displays the diff in a weird way, but there still are two lines before the next heading.

Right, my bad. It's what I get for reviewing PRs late at night! 😄

Btw, thanks for the care for commit messages. It's an often overlooked detail. Keep it up!