Added link to security incident response process

Author: hlflanagan

contribute.md

@@ -12,4 +12,6 @@ that you [can join](https://join.slack.com/t/identity-python/shared_invite/enQtN
 
 Participation in all Identity Python projects is govered by our [Note Well](https://github.com/IdentityPython/Governance/blob/master/Note-Well.md).
 
+To report security vulnerabilities, please see our [Security Incident Response](https://github.com/IdentityPython/Governance/blob/master/idpy-incidentresponse.md) process. 
+
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