chore: added article about mounting and using an encrypted device

knowledge base/mount and use an encrypted device.md

@@ -0,0 +1,54 @@
+# Mount and use an encrypted device
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL:DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL:DR
+
+```sh
+# Encrypt the device.
+cryptsetup luksFormat '/dev/sda'
+
+# Open the encrypted device.
+# 'mapper_name' is any name you want. It will be used by the device mapper.
+cryptsetup open '/dev/sda' 'mapper_name'
+
+# Format the volume.
+mkfs.btrfs -f --label 'label' '/dev/mapper/mapper_name'
+
+# Mount the volume.
+mkdir -p 'path/to/mount/point'
+mount -t 'filesystem' -o 'mount,options' '/dev/mapper/mapper_name' 'path/to/mount/point'
+
+# Do something.
+btrfs subvolume create 'path/to/subvolume/in/mount/point'
+chown 'user':'group' 'path/to/subvolume/in/mount/point'
+
+# Umount the volume.
+umount 'path/to/mount/point'
+
+# Close the device.
+cryptsetup close '/dev/mapper/mapper_name'
+```
+
+## Further readings
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- script: [Create an encrypted BTRFS device]
+- script: [Create an encrypted ZFS device]
+
+<!-- project's references -->
+<!-- internal references -->
+
+[further readings]: #further-readings
+
+[create an encrypted btrfs device]: scripts/create-an-encrypted-btrfs-device.sh
+[create an encrypted zfs device]: scripts/create-an-encrypted-btrfs-device.sh
+
+<!-- external references -->