[ADD] add some fields for import

models/product_category.py

@@ -12,6 +12,7 @@ class ProductCategory(models.Model):
     # ------------------------------------------------------
     symbol = fields.Char("Symbole")
     accessory_label = fields.Char("Nom de l'accessoire associé")
+    nurseryman_id =  fields.Char("Numéro de pépinieriste")
 
     # ------------------------------------------------------
     # SQL Constraints