Set up Forgerock as identity provider to Nexus GO PDF Signing

For a complete instruction on how to set up access to Nexus GO Signing with Forgerock as identity provider (IDP), see https://github.com/technologynexus/nexusgo-forgerock. 

The configuration is based on SAML federation and is done in three steps: first preparation in Forgerock, then in Nexus GO Signing and then the configuration is completed in Forgerock.