Add hello-world file

[Holzhaus]

I made a commit on main, then tried to push:

$ git push origin main
Enumerating objects: 4, done.
Counting objects: 100% (4/4), done.
Delta compression using up to 16 threads
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 296 bytes | 296.00 KiB/s, done.
Total 3 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
remote: error: GH013: Repository rule violations found for refs/heads/main.
remote: Review all repository rules at https://github.com/mixxxdj/playground/rules?ref=refs%2Fheads%2Fmain
remote:
remote: - Changes must be made through a pull request.
remote:
To github.com:mixxxdj/playground.git
 ! [remote rejected] main -> main (push declined due to repository rule violations)
error: failed to push some refs to 'github.com:mixxxdj/playground.git'

Fix:

$ git branch -m hello
$ git push origin hello
Enumerating objects: 4, done.
Counting objects: 100% (4/4), done.
Delta compression using up to 16 threads
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 296 bytes | 296.00 KiB/s, done.
Total 3 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
remote:
remote: Create a pull request for 'hello' on GitHub by visiting:
remote:      https://github.com/mixxxdj/playground/pull/new/hello
remote:
To github.com:mixxxdj/playground.git
 * [new branch]      hello -> hello

[Swiftb0y]

Test approval

[Swiftb0y]

ah, don't have the rights here I guess...