add skills

[bdon]

@migurski @wipfli would like your thoughts on the way to structure this for letting an agent drive the entire cycle:

• download a extract from SliceOSM
• build the tiles
• do programmatic, and later visual, analysis of the built output

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wipfli]

This look like a good addition, thanks for creating these skills.
Two points that come to mind both in the overture skill:

1. The overture types have changed over time. Maybe they have fully stabilized now but if new types appear we should update this skill.
2. Maybe instead of going into a .venv folder to get to the overture cli tool suggest using uvx overturemaps download ...