Add readme for pam module
Add readme for pam module

open-policy-agent/contrib,tsandall/contrib,open-policy-agent/contrib,open-policy-agent/contrib,open-policy-agent/contrib,tsandall/contrib,open-policy-agent/contrib,tsandall/contrib,tsandall/contrib,tsandall/contrib,open-policy-agent/contrib,open-policy-agent/contrib,tsandall/contrib,open-policy-agent/contrib,tsandall/contrib