Add Texkit 4 egg

[hafometh88]

Description

• Adds the Tekxit 4 modpack egg

Checklist for all submissions

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

New egg Submissions

1. [X] 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. [X] 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. [X] Have you added a unique README.md for the egg you are adding according to the alphabetical order?
5. [X] 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. [X] The egg was exported from the panel