[Feat] Add first party agent skill

Target Use Case

A first party agent skill that guides agents to use the patterns from react-map-gl and not force raw maplibre-gl-js from training data into the app.

Proposal

Extracted from https://github.com/visgl/react-map-gl/pull/2593#issuecomment-5110952741, https://github.com/visgl/react-map-gl/pull/2593#issuecomment-5101635060

I suggest to use https://tanstack.com/intent/latest to setup a first party agent skill that handles common pitfalls and gets agents to work within the best practices of react-map-gl.

I have a personal version of this at https://github.com/FixMyBerlin/fixmyskills/blob/main/skills/react-map-gl/SKILL.md which I created and expanded whenever I ran into issues where agents dump raw maplible-gl-js APIs into my react / react-map-gl app instead of using and relying on the react like patterns that react-map-gl provides. I image this can be used as a starting a point.