add cron job configutation

documentation about preview files generation

README.md

@@ -7,6 +7,7 @@ Using [NextCloud](https://nextcloud.com/)
 - [command](#command)
 - [maintenance mode](#maintenance-mode)
   - [scan files](#scan-files)
+  - [preview generator](#preview-generator)
   - [repair tree](#repair-tree)
   - [delete file locks](#delete-file-locks)
 - [Setup](#setup)
@@ -14,7 +15,6 @@ Using [NextCloud](https://nextcloud.com/)
   - [Add helm chart](#add-helm-chart)
   - [Update Helm chart](#update-helm-chart)
   - [Install / Update](#install--update)
-- [backups](#backups)
 
 ## command
 
@@ -29,6 +29,21 @@ su -s /bin/bash www-data -c "php -d memory_limit=-1 /var/www/html/occ maintenanc
 
 ``` bash
 su -s /bin/bash www-data -c "php -d memory_limit=-1 /var/www/html/occ files:scan --all"
+
+```
+
+### preview generator
+
+<https://apps.nextcloud.com/apps/previewgenerator>
+
+``` bash
+su -s /bin/bash www-data -c "./occ preview:generate-all -vvv"
+su -s /bin/bash www-data -c "./occ preview:generate-all --path=marcio.fernandes/files/Photos -vvv"
+```
+
+``` bash
+# cron job
+ php /var/www/nextcloud/occ preview:pre-generate 
 ```
 
 ### repair tree