[docs] major update

docs/user/buying/docs.user.buying.supplier.md

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+---
+{
+	"_label": "Supplier Master"
+}
+---
+Suppliers are companies or individuals who provide you with products or services. They are treated in exactly the same manner as Customers in ERPNext.
+
+
+You can create a new Supplier via:
+
+> Buying > Supplier > New Supplier
+
+![Supplier](img/supplier.png)
+
+
+### Contacts and Addresses
+
+ Contacts and Addresses in ERPNext are stored separately so that you can attach multiple Contacts or Addresses to Customers and Suppliers. To add a Contact or Address go to Buying and click on “New Contact” or “New Address”.
+
+
+> Tip: When you select a Supplier in any transaction, one Contact and Address gets pre-selected. This is the “Default Contact or Address”. So make sure you set your defaults correctly!
+
+
+
+
+> Buying > Contact > New Contact
+
+![Contact](img/contact.png)
+
+
+
+
+You can also import from the Data Import Tool