[docs] new selling pages added

docs/user/buying/docs.user.buying.purchase_order.md

@@ -5,11 +5,17 @@
 ---
 A Purchase Order is analogous to a Sales Order. It is usually a binding contract with your Supplier that you promise to buy a set of Items under the given conditions.
 
-In ERPNext, you can make a Purchase Order by going to:
+
+A Purchase Order can  be automatically created from a Material Request or Supplier Quotation.
+
+
+![Purchase Order](img/purchase-order-f.jpg)
+
+
+In ERPNext, you can also make a Purchase Order directly by going to:
 
 > Buying > Purchase Order > New Purchase Order
 
-A Purchase Order can also be automatically created from a Purchase Request or  Supplier Quotation.
 
 
 ![Purchase Order](img/purchase-order.png)

docs/user/buying/docs.user.buying.supplier_quotation.md

@@ -6,18 +6,25 @@
 A Supplier Quotation is a formal statement of promise by potential supplier to supply the goods or services required by a buyer, at specified prices, and within a specified period. A quotation may also contain terms of sale and payment, and warranties. Acceptance of quotation by the buyer constitutes an agreement binding on both parties.
 
 
-You can make a Supplier Quotation directly from:
+You can make a supplier quotation from a Material Request
+
+
+
+![Supplier Quotation](img/supplier-quotation-f.jpg)
+
+
+
+You can also make a Supplier Quotation directly from:
 
 > Buying > Supplier Quotation > New Supplier Quotation
 
-or directly from the Purchase Request.
-
 
 
 ![Supplier Quotation](img/supplier-quotation.png)
 
 
 
+
 If you have multiple **Suppliers** who supply you with the same **Item**, you usually send out a message (Request for Quote) to various **Suppliers**. In many cases, especially if you have centralized buying, you may want to record all the quotes so that 
 
 - You can easily compare prices in the future