docs: add manual page for acl.cfg

docs/config/acl/format.rst

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+This file contains the access control list for the Proxmox Backup
+Server API.
+
+Each line starts with ``acl:``, followed by 4 additional values
+separated by collon.
+
+:propagate: Propagate permissions down the hierachrchy
+
+:path: The object path
+
+:User/Token: List of users and token
+
+:Role: List of assigned roles
+
+Here is an example list::
+
+   acl:1:/:root@pam!test:Admin
+   acl:1:/datastore/store1:user1@pbs:DatastoreAdmin
+
+
+You can use the ``proxmox-backup-manager acl`` command to manipulate
+this file.

docs/config/acl/man5.rst

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+==========================
+acl.cfg
+==========================
+
+.. include:: ../../epilog.rst
+
+-------------------------------------------------------------
+Access Control Configuration
+-------------------------------------------------------------
+
+:Author: |AUTHOR|
+:Version: Version |VERSION|
+:Manual section: 5
+
+Description
+===========
+
+The file /etc/proxmox-backup/user.cfg is a configuration file for Proxmox
+Backup Server. It contains the access control configuration for the API.
+
+File Format
+===========
+
+.. include:: format.rst
+
+
+Roles
+=====
+
+The following roles exist:
+
+.. include:: roles.rst
+
+
+.. include:: ../../pbs-copyright.rst