Add cryptsetup.md.

pages/linux/cryptsetup.md

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+# cryptsetup
+
+> Manage plain dm-crypt and LUKS encrypted volumes.
+
+- Format a drive (or a file) to make it a LUKS volume:
+
+`cryptsetup luksFormat {{path_to_luks_volume_to_be}}`
+
+- Open a volume so that you can access it decrypted on the fly at /dev/mapper/{{a}}:
+
+`cryptsetup luksOpen {{path_to_luks_volume_to_be}} {{a}}`