Add section on CSP for Django

[Anto59290]

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[arunjohnkuruvilla]

I would recommend adding a link to Django's documentation for CSP middleware. This will help the reader explore further if they are interested.

[arunjohnkuruvilla]

I would recommend adding a link to the nonce section of the Content Security Policy Cheatsheet that explains nonces further.

[jmanico]

These seems small and reasonable. If you give us a clean PR on just this and only this I will accept it.

Also, please run your sentences through a grammar checker as well, or ask AI to check your sentences for grammar.

[Copilot]

Pull request overview

This PR adds a new section on Content Security Policy (CSP) implementation to the Django Security Cheat Sheet. The section aims to provide guidance on configuring CSP headers in Django applications.

Changes:

• Added a new "Content Security Policy" section with middleware configuration, CSP policy settings, template context processor configuration, and nonce usage examples

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