Added a section around the delivery of Terms and Conditions (#48)

Including the addition of addition of a `termsOfService` property to the Offer object

TODO update modelling spec and developer tools

Author: drchristhorpe

EditorsDraft/index.html

@@ -917,6 +917,23 @@
 subsequent requests to an **order** should only be initiated by the **broker**
 which created the **order**.
 
+### Delivery of terms and conditions
+
+The **broker** should make the **customer** aware of and assent to any specific
+Terms and Conditions and Privacy Policy for using their service at the point of
+a **customer** signing up to the service and/or providing their contact details.
+
+Since, during **booking**, the details of the **customer** are provided to the
+**booking system** and the **seller**, the **broker** should inform the
+**customer** of this any implications with resepct to GDPR and any other
+data protection legislation.
+
+Any specific Terms and Conditions for the **offer** being taken, or Terms and
+Conditions relating to the **seller** should be made available via a URL as a
+`termsOfService` property on the **offer**. (https://pending.schema.org/termsOfService)
+
+
+
     </section>
 
     <section class="normative">