add nextcloud readme

nextcloud/README.md

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+# Nextcloud setup
+https://help.nextcloud.com/t/howto-ubuntu-docker-nextcloud-talk-collabora/76430
+Follow the guide above as close as possible and deviate where traefik is being used etc.
+
+There is also somewhere a step to set up an alias for `occ` that can be used outside the container to directly execute occ cli commands inside the container. (Should be in the guide above)
+
+#Nextcloud self check fixes
+Set default_phone_region like this:
+occ config:syste:set default_phone_region --value="DE"
+
+# Collabora loolwsd setup
+Check if you have to alter this line in the _collabora/loolwsd.xml_ file:
+
+`<host desc="Regex pattern of hostname to allow or deny." allow="true">nextcloud\\.sporada\\.eu</host>`
+
+# Server Security and tuning
+Look at the documentation for server security and server tuning: https://docs.nextcloud.com/server/21/admin_manual/installation/index.html#
+Do as much as is possible with the docker setup. The PHP stuff for example is not needed.
+- Do defnitly the database cache things.
+- Lower logging level
+- Change size of the php cache etc. (This should be part of the config file mounted into the container)
+
+
+# Photo Preview Generation:
+- Photo viewer tweaks: https://rayagainstthemachine.net/linux%20administration/nextcloud-photos/
+- Use these values to svae space on prieview files and speed nextcloud up. https://ownyourbits.com/2019/06/29/understanding-and-improving-nextcloud-previews/
+```sh
+occ config:app:set previewgenerator squareSizes --value="32 256"
+occ config:app:set previewgenerator widthSizes  --value="256 384"
+occ config:app:set previewgenerator heightSizes --value="256"
+occ config:system:set preview_max_x --value 2048
+occ config:system:set preview_max_y --value 2048
+occ config:system:set jpeg_quality --value 60
+occ config:app:set preview jpeg_quality --value="60"
+```
+- I created a cron Job outside the container using the `occ` client command to trigger photo pre generation every day.
+- Maybe this can be added to the cron nextcloud container?