Guide on how to bolt-on SAML/SCIM using FusionAuth

[mooreds]

There's a need for adding SAML/SCIM to an existing application. There are some vendors that support this.

FusionAuth could be used in this fashion, we should document how to do so.

• Set up an application which manages its own users. But have the ability to add users to an organization/tenant (inside the app)
• Set up FusionAuth as a side application component to be used only for SAML/SCIM
• For core users, show the application login form, but for users in a certain tenant, enable links to login via SAML
• Show how admin users of a tenant can configure a SAML connection (using the API to add/update FusionAuth Identity Provider) and SCIM (using the API)