add readme (#6664)

src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/AutoConfirmUser/README.md

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+# Automatic User Confirmation
+
+Owned by: admin-console
+
+Automatic confirmation requests are server driven events that are sent to the admin's client where via a background service the confirmation will occur. The basic model
+for the workflow is as follows:
+
+- The Api server sends an invite email to a user.
+- The user accepts the invite request, which is sent back to the Api server
+- The Api server sends a push-notification with the OrganizationId and UserId to a client admin session.
+- The Client performs the key exchange in the background and POSTs the ConfirmRequest back to the Api server
+- The Api server runs the OrgUser_Confirm sproc to confirm the user in the DB
+
+This Feature has the following security measures in place in order to achieve our security goals:
+
+- The single organization exemption for admins/owners is removed for this policy.
+  - This is enforced by preventing enabling the policy and organization plan feature if there are non-compliant users
+- Emergency access is removed for all organization users
+- Automatic confirmation will only apply to the User role (You cannot auto confirm admins/owners to an organization)
+- The organization has no members with the Provider user type.
+  - This will also prevent the policy and organization plan feature from being enabled
+  - This will prevent sending organization invites to provider users