[docs] added pages from user manual

docs/docs.user.setup.supplier.md

@@ -0,0 +1,17 @@
+---
+{
+	"_label": "Supplier Master"
+}
+---
+Suppliers are companies or individuals who provide you products or services. They are treated in exactly the same manner as Customers in ERPNext.
+
+1. Separate Account Ledgers are created for the Supplier in the Company under “Accounts Payable”.
+1. You can have multiple Addresses and Contacts for Suppliers.
+1. Suppliers are categorized as Supplier Type.
+1. If you set “Credit Days”, this will automatically set the due date in Purchase Invoices.
+
+You can create a new Supplier via:
+
+> Buying > Supplier > New Supplier
+
+or importing from the Data Import Tool