docs: Add alt text

[ianlewis]

Description:

Adds alt text to the image in the README for accessibility purposes.

Related Issues:

N/A

Checklist:

• [x] Review the CONTRIBUTING.md documentation.
• [x] Add a reference to a related issue in the repository.
• [x] Add a description of the changes proposed in the pull request.
• [x] Add unit tests if applicable.
• [x] Update documentation if applicable.
• [x] Add a note in the CHANGELOG.md if applicable.
• [x] Sign the Google CLA.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c5f0b61) 79.04% compared to head (ea34b7e) 79.04%.

Additional details and impacted files

[](https://app.codecov.io/gh/ianlewis/todos/pull/1462?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ian+Lewis) ```diff @@ Coverage Diff @@ ## main #1462 +/- ## ======================================= Coverage 79.04% 79.04% ======================================= Files 15 15 Lines 902 902 ======================================= Hits 713 713 Misses 138 138 Partials 51 51 ```