Update README.md

Author: electricalgorithm

README.md

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 # Home Security System
 
+[![DOI](https://zenodo.org/badge/711162076.svg)](https://doi.org/10.5281/zenodo.15488272)
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 This project is a home security system that uses a Raspberry Pi and a camera, which detects human presence and sends a message with a picture of the intruder. The system checks connected mac addresses, and if a protector (household member) is home, closes the home security system.