Add categories descriptions

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

controls/core/src/README.md

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+# Secure your codebase
+
+Your code is one of your most valuable asset, you want to be sure things are
+running smoothly and in a predictable way.
+
+## Why does it matter?
+
+A proper development lifecycle insure your application is iterated on in a
+secure and systematic manner. It reduces the chances of error or vulnerabilities
+and so increase the stability, integrity and security of your software. Also, it
+helps you scale your engineering team.
+
+## How can I proceed?
+
+- **Communicate policies:** Publish and update key documents and services.
+- **Implement structured processes:** Define a development lifecycle for
+  software, adopt Infrastructure-as-Code (IaC), and deploy configuration
+  management systems to maintain consistency and security.