Update security-best-practices-for-your-project.md

[BlueButterflies]

Translated file security-best-practices-for-your-project.md in Bulgarian language

• Have you followed the contributing guidelines?
• Have you explained what your changes do, and why they add value to the Guides?

Please note: we will close your PR without comment if you do not check the boxes above and provide ALL requested information.

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I translated file security-best-practices-for-your-project.md in bulgarian language

[samuelmendez8902]

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