Add a concise organization README describing AudioHub and the .github repository purpose

[Copilot]

The repository README was only a placeholder and did not explain what AudioHub is. This update adds a short, clear overview of AudioHub and clarifies the role of this .github repo for shared org-level guidance.

• README content refresh

  • Replaced the placeholder title with # AudioHub
  • Added a one-paragraph summary of AudioHub’s mission (audio project creation, organization, and sharing)
  • Added a focused description of this repository as the central place for shared documentation, standards, and contributor resources

• Resulting README structure

  • Clear project identity
  • Brief organization context
  • Explicit purpose of the .github repository

# AudioHub

AudioHub est un espace collaboratif dédié à la création, l’organisation et le partage de projets audio.

Ce dépôt `.github` centralise les informations communes de l’organisation : documentation, standards et ressources utiles pour contribuer aux projets AudioHub.

Original prompt

Créer un readme qui résume ce qu'est audiohub