Add a CODE_OF_CONDUCT.md file to define expected behavior for contributors to FlaskSecForge

[Reprompts]

📚 Objective:
Add a CODE_OF_CONDUCT.md file to define expected behavior for contributors to FlaskSecForge.

✍️ Details:

Create a new file named CODE_OF_CONDUCT.md at the root of the repository.

Use a friendly and simple version, or base it on the Contributor Covenant.

Mention respectful collaboration, avoiding harassment, and reporting guidelines.

📋 Checklist:

Add welcoming introduction.

Define expected and unacceptable behavior.

Add instructions for reporting issues (e.g., via GitHub issues or email).

Link it in README.md.

🏷️ Labels:
good first issue documentation help wanted