Add categories descriptions

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

controls/core/network/README.md

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+# Protect your Network
+
+Your network connects your devices, servers, and systems.
+
+## Why does it matter?
+
+Protecting your network is essential for the data and services your company
+provides. Network security helps ensure that sensitive data is accessible only
+to authorized users and that systems remain operational and resilient to
+attacks.
+
+## How can I proceed?
+
+Strengthening network security in a targeted, efficient way is essential. By
+restricting access to infrastructure, implementing protective layers like
+Cloudflare, and conducting regular security assessments, you can effectively
+safeguard your systems against unauthorized access and potential attacks.