add readme

lacagette_addons/pos_meal_voucher/README.rst

@@ -58,6 +58,9 @@ Products
 
 .. figure:: https://raw.githubusercontent.com/legalsylvain/pos/12.0-ADD-pos_meal_voucher/pos_meal_voucher/static/description/pos_config_form.png
 
+* configure if you want to allow or forbid to exceed the maximum allowed by ticket and for order  (Give change on meal voucher)
+
+
 Usage
 =====
 
@@ -86,6 +89,9 @@ It is a non blocking warning, because we don't want to prevent an order to be do
 if products are not correctly set, or if a recent law changed the maximum amount that can
 be used each day. (A recent case occured in France, during the Covid-19 pandemy)
 
+If you want to make it impossible to finish an order if the amount of meal voucher is too big then uncheck the option "meal_voucher_change_accepted"
+In this case if the cashier tries to validate the order the warning will redirect him to the paiement page.
+
 Note
 ~~~~