Add SteelMC server

[JunkyDeveloper]

Description

Added a json and yaml egg for SteelMC, which is Rust based minecraft server. For that a new rust based section was added to the REAME.md because there are at least 5-6 more rust based server which I know of, so more will come in the future!

Checklist for all submissions

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [] Have you tested and reviewed your changes with confidence that everything works?
• Did you branch your changes and PR from that branch and not from your master branch?
  • If not, why?:

New egg Submissions

1. Does your submission pass tests (server is connectable)?
2. Does your egg use a custom docker image?
   • Have you tried to use a generic image?
   • Did you PR the necessary changes to make it work?
3. Have you added the egg to the main README.md and any other README files in subdirectories of the egg (e.g /game_eggs) according to the alphabetical order?
4. Have you added a unique README.md for the egg you are adding according to the alphabetical order?
5. You verify that the start command applied does not use a shell script
   • If some script is needed then it is part of a current yolk or a PR to add one
6. The egg was exported from the panel

[QuintenQVD0]

For releases from github I would advice to use this script: https://github.com/pelican-eggs/eggs/blob/master/scripts/github_release_grabber.sh

[JunkyDeveloper]

For releases from github I would advice to use this script: https://github.com/pelican-eggs/eggs/blob/master/scripts/github_release_grabber.sh

Thanks for that input, will copy it and remove the match, because this script will never be updated and don't see a reason, to allow the users to select another executable

[QuintenQVD0]

For releases from github I would advice to use this script: https://github.com/pelican-eggs/eggs/blob/master/scripts/github_release_grabber.sh

Thanks for that input, will copy it and remove the match, because this script will never be updated and don't see a reason, to allow the users to select another executable

you are allowed to hardcode it in the install script if needed, just like the github package / url

[JunkyDeveloper]

you are allowed to hardcode it in the install script if needed, just like the github package / url

Thanks I added the install script with some changes