nextcloud: add nextcloud page and docker image

wiki/docker-images/nextcloud.md

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+# NextCloud
+
+The official container and documentation was made by [NextCloud](https://hub.docker.com/_/nextcloud).
+This docker-rebuild is made up by a `docker-compose.yml` file.
+The services in this files are explained seperately.
+The main Docker container needs a database in form of a [MariaDB](./mariadb.md)
+Docker container.
+
+## Volumes
+
+Set the following volumes in the `volumes:` section of the docker-compose file.
+
+| Volume-Name | Container mount | Description                              |
+| ----------- | --------------- | ---------------------------------------- |
+| `nextcloud` | `/var/www/html` | storage for nextcloud plugins and config |
+
+## Ports
+
+Set the following ports in the `ports:` section.
+
+| Container Port | Recommended outside port | Protocol | Description |
+| -------------- | ------------------------ | -------- | ----------- |
+| `80`           | `80`                     | TCP      | WebUI       |
+
+## Rebuild
+
+```shell
+#!/bin/sh
+docker-compose down
+docker pull nextcloud:latest
+docker pull mariadb:latest
+docker-compose up -d
+```
+
+## Docker-Compose.yml
+
+```yml
+version: '2'
+
+volumes:
+  nextcloud:
+  db:
+
+services:
+  db:
+    image: mariadb
+    restart: always
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
+    volumes:
+      - db:/var/lib/mysql
+    environment:
+      - MYSQL_ROOT_PASSWORD=<mysql root password>
+      - MYSQL_PASSWORD=<mysql password>
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+
+  app:
+    image: nextcloud
+    restart: always
+    ports:
+      - 8080:80
+    links:
+      - db
+    volumes:
+      - nextcloud:/var/www/html
+    environment:
+      - MYSQL_PASSWORD=<mysql password>
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+      - MYSQL_HOST=db
+
+volumes:
+    db:
+        driver: local
+    nextcloud:
+        driver: local
+
+```

wiki/nextcloud.md

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+# NextCloud
+
+NextCloud is a free and open source client-server cloud-service.
+
+## Server
+
+A server can be setup via docker with the [nextcloud image](./docker-images/nextcloud.md).
+
+## WebDAV
+
+You can access ownCloud via WebDAV with the link
+`https://<nextcloud instance>/remote.php/dav/files/<user>/<path to folder or file>`.