Create index.md

[mlkmooeeeed]

Why:

Closes ISSUE

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• [x] I have reviewed my changes in staging (look for the "Automatically generated comment" and click the links in the "Preview" column to view your latest changes).
• [x] For content changes, I have completed the self-review checklist.