Add categories descriptions

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

controls/core/data/README.md

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+# Safeguard your data
+
+Your data is one of your company most valuable asset - you must keep it safe
+
+## Why does it matter?
+
+It minimizes the risk of unauthorized access, data breaches, and loss. By
+implementing data security measures, you demonstrates a commitment to protecting
+client information.
+
+## How can I proceed?
+
+Implement measures to protect data from unauthorized access and set up processes
+to regularly secure and monitor its location.

controls/core/infra/README.md

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+# Secure your infrastructure
+
+## Why does it matter?
+
+Your infrastructure holds your sensitive data and makes sure your service is
+available to your customers. Protecting it from unauthorized access or attacks
+is key to prevent any data leak or service outage.
+
+## How can I proceed?
+
+To secure your infrastructure, you will need to:
+
+1. Understand what your are protecting
+2. Regulate access
+3. Log changes
+4. Fix known vulnerabilities

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.

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.