Added link how to sync ldap

roles/docker-nextcloud/LDAP.md

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+Natürlich, hier ist der aktualisierte Abschnitt inklusive des allgemeinen LDAP-Synchronisationsbefehls:
+
+---
+
+## Add LDAP Users Manually for Immediate Sharing
+
+In a default Nextcloud + LDAP setup, user accounts are only created in the internal Nextcloud database **after their first login**. This means that even if a user exists in LDAP, they **cannot receive shared files or folders** until they have logged in at least once—or are manually synchronized.
+
+To make LDAP users available for sharing **without requiring initial login**, follow these steps:
+
+### 1. Search for the User in LDAP
+
+Check if the user exists in the configured LDAP directory:
+
+```bash
+docker exec -u www-data nextcloud-application php occ ldap:search <username>
+```
+
+If the user is found, proceed to the next step.
+
+### 2. Create the User in Nextcloud from LDAP
+
+Manually trigger a sync to register the user in the Nextcloud database:
+
+```bash
+docker exec -u www-data nextcloud-application php occ ldap:check-user --update <username>
+```
+
+**Example:**
+
+```bash
+docker exec -u www-data nextcloud-application php occ ldap:check-user --update viktoriakaffanke
+```
+
+Once executed, the user becomes fully available in the system—for sharing, group membership, and permissions—even without logging in.
+
+### 3. Synchronize All Known Users (Optional)
+
+To synchronize account data (display name, mail address, group memberships, etc.) for **all users** currently known to Nextcloud:
+
+```bash
+docker exec -u www-data nextcloud-application php occ user:sync-account-data
+```
+
+This step is especially useful after modifying LDAP attributes or group memberships, ensuring up-to-date data in the Nextcloud UI and permission system.
+
+---
+
+Let me know if you'd like a similar section for OIDC or automated sync in Ansible.