[docs] knowledge files and faq

docs/user/knowledge/docs.user.knowledge.make_to_order.md

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+---
+{
+	"_label": "Make-to-Order Manufacturing"
+}
+---
+
+Make-to-order is a manufacturing process in which manufacturing starts only after a customer's order is received.
+
+The company has some standard items but the product is only made when the customer places an order. This is true for furniture, for designer gift items etc.
+
+Manufacturing after receiving customer's orders means to start a pull-type supply chain operation because manufacturing is performed when demand is confirmed, i.e. being pulled by demand. 
+
+In this type of manufacturing, production orders are linked to one or more sales orders.
+