void Start()
{
List <string> all_ressources = Ressources.getAllRessources();
for (int i = 0; i < all_ressources.Count; i++)
{
ressourcesNeeded.Add(all_ressources[i], 0);
}
particule_system = GetComponentInChildren <ParticleSystem>();
current_obj = Instantiate(buildingEtapes[startingIndex.ToString()], transform.position, Quaternion.identity);
}