docs: add active directory docs

docs/integrations/sources/active-directory/index.md

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+# Active Directory Integration
+
+## Preparation
+
+The following placeholders will be used:
+
+ - `ad.company` is the Name of the Active Directory domain.
+ - `passbook.company` is the FQDN of the passbook install.
+
+## Active Directory Setup
+
+1. Open Active Directory Users and Computers
+
+2. Create a user in Active Directory, matching your naming scheme
+
+    ![](./01_user_create.png)
+
+3. Give the User a password, generated using for example `pwgen 64 1`.
+
+4. Open the Delegation of Control Wizard by right-clicking the domain.
+
+5. Select the passbook service user you've just created.
+
+6. Ensure the "Reset user password and force password change at next logon" Option is checked.
+
+    ![](./02_delegate.png)
+
+## passbook Setup
+
+In passbook, create a new LDAP Source in Administration -> Sources.
+
+Use these settings:
+
+- Server URI: `ldap://ad.company`
+
+    For passbook to be able to write passwords back to Active Directory, make sure to use `ldaps://`
+
+- Bind CN: `<name of your service user>@ad.company`
+- Bind Password: The password you've given the user above
+- Base DN: The base DN which you want passbook to sync
+- Property Mappings: Select all and click the right arrow
+
+The other settings might need to be adjusted based on the setup of your domain.
+
+- Addition User/Group DN: Additional DN which is *prepended* to your Base DN for user synchronization.
+- Addition Group DN: Additional DN which is *prepended* to your Base DN for group synchronization.
+- User object filter: Which objects should be considered users.
+- Group object filter: Which objects should be considered groups.
+- User group membership field: Which user field saves the group membership
+- Object uniqueness field: A user field which contains a unique Identifier
+- Sync parent group: If enabled, all synchronized groups will be given this group as a parent.
+
+After you save the source, a synchronization will start in the background. When its done, you cen see the summary on the System Tasks page.
+
+![](./03_pb_status.png)