Add a "see also" section in Readme

[esgn]

Add a "see also" section in readme which lists similar projects or alternatives if they exist

[mborne]

https://github.com/datagouv/datagouv-mcp (basé sur API https://explore.data.gouv.fr/fr/ ?)

[mborne]

https://github.com/mapbox/mcp-server

[mborne]

https://tricoteuses.fr/services/mcp-parlement

[mborne]

https://github.com/datagouv/datagouv-skill