dmidecode.md: add page (#1855)

pages/linux/dmidecode.md

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+# dmidecode
+
+> Display the DMI (alternatively known as SMBIOS) table contents in a human-readable format.
+> Requires root privileges.
+
+- Show all DMI table contents:
+
+`sudo dmidecode`
+
+- Show the BIOS version:
+
+`sudo dmidecode -s bios-version`
+
+- Show the system's serial number:
+
+`sudo dmidecode -s system-serial-number`
+
+- Show all the BIOS information:
+
+`sudo dmidecode -t bios`
+
+- Show all the system information:
+
+`sudo dmidecode -t system`