Generic Language for prescriptive SETs - Issue 255 (#267)

* Update openid-sharedsignals-framework-1_0.md

added a sub section under Section 4 called "SSF Prescriptive SETs and an example figure of what a prescriptive SET may look like under Section 5

* Update openid-sharedsignals-framework-1_0.md

Author: iamseanodentity

openid-sharedsignals-framework-1_0.md

@@ -483,6 +483,9 @@ on this subject. The Shared Signals Framework requires further restrictions:
 ### Signature Key Resolution {#signature-key-resolution}
 The signature key can be obtained through "jwks_uri", see {{discovery}}.
 
+### SSF Prescriptive SETs {#prescriptive-sets}
+The Shared Signals Framework allows each deployment or integration to define its own event processing behaviors, ranging from informational input to additional processing needed, to mandatory enforcement.
+
 ### The "iss" Claim {#iss-claim}
 The "iss" claim MUST match the "iss" value in the Stream Configuration data for the stream
 that the event is sent on. Receivers MUST validate that this claim matches the "iss"