Add categories descriptions

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

controls/personnel/lifecycle/README.md

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+# Set up your employees for success
+
+## Why does it matter?
+
+Without the proper security measures in place, employees can inadvertently
+expose your company to breaches and vulnerabilities. Providing secure access and
+clear guidelines on handling sensitive information is crucial to protect your
+organization from potential threats.
+
+## How can I proceed?
+
+You will focus on two things:
+
+- **Processes:** whether it is to recruit, onboard or off-board, things are
+  prepared and you are sure not to forgot anything.
+- **Enabling**: empower your employees to take the best decision possible to
+  maintain your security posture