docs: adding a glossary section to the documentation

docs/README.md

@@ -15,6 +15,7 @@ The Order Network eXchange (onX) is an open specification built on the Model Con
 - [Problem Statement](introduction/problem-statement.md) - Why we need a universal standard
 - [Why MCP?](introduction/why-mcp.md) - The technology behind the standard
 - [Ecosystem Benefits](introduction/ecosystem-benefits.md) - Value for every stakeholder
+- [Glossary](introduction/glossary.md) - Glossary of terms used by the standard
 
 ### Technical Specification
 - [Architecture Overview](standard/overview.md) - System design and components

docs/introduction/glossary.md

@@ -0,0 +1,68 @@
+##Glossary
+
+
+---
+---
+
+## Order
+
+A canonical representation of a customer order.
+
+
+
+---
+
+## LineItem
+
+A component of an Order representing a specific product and quantity.
+
+
+---
+
+## Customer
+
+An entity representing the party that placed an Order.
+
+
+---
+
+## Product
+
+A canonical representation of a sellable or fulfillable item.
+
+
+---
+
+## Inventory
+
+A representation of product availability at a specific Location.
+
+
+---
+
+## Location
+
+A physical or logical place relevant to commerce or fulfillment
+operations.
+
+
+---
+
+## Shipment
+
+A representation of the physical movement of goods.
+
+
+---
+
+## FulfillmentStatus
+
+An enumerated value representing the lifecycle state of an Order,
+LineItem, or Shipment.
+
+---
+
+## Notes
+
+
+