Add systemd automount docu

pages/02.linux/30.systemd-automount/default.en.md

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+---
+title: Systemd Automount
+---
+
+[toc]
+
+Systemd can be used to mount filesystems not only on boot (simple `.mount` file), but also on request by any process. (`.automount` file)  
+
+## Mount file
+The `.mount` file should be placed in `/etc/systemd/system`  
+**NOTE: The filename must be (mountpoint).mount with slashes `/` being replaced with dashes `-`**  
+Example: `/mnt/target` --> `mnt-target.mount`  
+
+Here's an example `.mount` file for a CIFS share  
+```
+[Unit]
+Description=cifs mount
+
+[Mount]
+What=//(url/ip)/(sharename)
+Where=/(target mountpoint)
+Type=cifs
+Options=defaults,username=(user),password=(password),file_mode=0640,dir_mode=0750,iocharset=utf8,uid=(local uid),gid=(local gid)
+
+[Install]
+WantedBy=multi-user.target
+```
+
+## Automount file
+The corresponding `.automount` file needs to have the same name as its `.mount` file  
+Example: `mnt-target.mount` and `mnt-target.automount`  
+
+```
+[Unit]
+Description=cifs automount
+
+[Automount]
+Where=/(target mountpoint)
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Enable the `.automount` file to mount the filesystem when necessary  
+`# systemctl enable (target-mount).automount`  
+