Add shield.io README badges and sponsorship

[dcousens]

This pull request adds some https://shields.io badges for

• npm
• MIT license
• Sponsored by Thinkmill

[changeset-bot]

⚠️ No Changeset found

Latest commit: c2c3953

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6a33c0b) 90.87% compared to head (06ec9be) 90.87%.

❗ Current head 06ec9be differs from pull request most recent head c2c3953. Consider uploading reports for the commit c2c3953 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #529   +/-   ##
=======================================
  Coverage   90.87%   90.87%           
=======================================
  Files          34       34           
  Lines        1546     1546           
  Branches      426      426           
=======================================
  Hits         1405     1405           
  Misses        135      135           
  Partials        6        6           

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[emmatown]

Why aren't you using markdown syntax?