docs/re-upload README after commit error

[tenthwalker]

Description

This PR re-creates our prior pull request for the README, which got accidentally merged on the wrong branch and then removed entirely while attempting to resolve that.

Contributors

@tenthwalker @ericahagle

Notes

Need a screenshot gif and for other group members to add wins/challenges if they have ideas for those.

Checklist

• [x] My PR has an appropriately descriptive and concise title.
• [x] My PR denotes any/all team members who contributed to it.
• [x] My code follows the Turing Style Guides and best practices.
• [x] I ran the code locally and verified that there are no visible errors.
• [x] docs: My PR clearly describes which doc(s) I'm updating and why.

[tenthwalker]

fixed the commit/branch errors with another pull request, this was too messy to fix here