Add AI contribution policy.

[kylebarron]

See developmentseed/deck.gl-raster#355

Same as pSpitzner/beets-flask#291 (comment)

Since this PR appears to be entirely AI-generated, I’m going to close it. We are not opposed to AI-generated contributions, but communication should be handled by a real person, and it should be clearly disclosed upfront if the content is AI-generated.

Please ensure this is communicated transparently in the future.

Originally posted by @kylebarron in #1134 (comment)

[kylebarron]

Ref developmentseed/.github#5

[kylebarron]

This is now auto-inherited on all devseed projects
https://github.com/developmentseed/lonboard?tab=coc-ov-file