[docs] major update

docs/user/setup/docs.user.setup.price_list.md

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+---
+{
+	"_label": "Price Lists"
+}
+---
+
+Price List is a  table of sale price for an Item. An Item can have multiple prices based on customer, currency, region, shipping cost etc. 
+
+A Price List is a place where different rate plans can be stored. It’s a name you can give to a set of Item prices. In case you have different zones (based on the shipping costs), for different currencies etc, you can maintain different Price Lists.You can maintain a Price List for your international customers with USD as transacting currency.
+
+
+![Price-List](img/price-lists.png)
+
+
+ A Price List is formed when you create different Item Prices. To import Item Price visit “Import Item Price”.