feat(curriculum): create css-positioning quiz

[Muhammad-Rebaal]

Checklist:

• [x] I have read and followed the contribution guidelines.
• [x] I have read and followed the how to open a pull request guide.
• [x] My pull request targets the main branch of freeCodeCamp.
• [x] I have tested these changes either locally on my machine, or GitPod.

Closes #56191

Hi @naomi-lgbt ! Hope you are well ! Take a look at the issue #56191 of creating the quiz of css-postitioning as I've completed that. Thank You for assigning this issue :) Regards @Muhammad-Rebaal