add(plugins): Dot & Grid Backgrounds

[TheNaubit]

Name	Link
Dot & Grid Backgrounds	https://github.com/TheNaubit/tailwind-dot-grid-backgrounds

Adds bg-grid and bg-dot classes to add easy-to-customize grid and dot pattern backgrounds with just CSS.

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• My item is in the right category
• My item is logically grouped below similar items
• My item's name and description respects the conventions of the list
• My item is awesome
• My item is in line with the Tailwind brand usage guidelines
• I have read and followed the contribution guidelines

[innocenzi]

Thanks!