Add categories descriptions

Signed-off-by: gearnode <bryan@frimin.fr>

controls/physical/hardware/README.md

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+# Manage your computers
+
+## Why does it matter?
+
+Your company devices have the potential to store or process data ⇒ If someone
+lose his laptop or it gets compromised, it can expose you to a data leak (and a
+few other things)
+
+## How can I proceed?
+
+You have to make sure that every device is properly set-up. To monitor things,
+the easiest way is to leverage a Mobile Device Management software (MDM), but if
+you are early in your development, proper guidelines are enough. On each
+machine, you need:
+
+- Screenlock is enabled
+- Firewall is active
+- Anti-malware detection is active
+- Data is encrypted