Add documentation

Author: bad-antics

docs/README.md

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+# NullSec Desktop Documentation
+
+## Quick Start
+```bash
+sudo apt install python3-gi python3-gi-cairo gir1.2-gtk-3.0 gir1.2-vte-2.91
+git clone https://github.com/bad-antics/nullsec-desktop
+cd nullsec-desktop && python3 ./nullsec-desktop
+```
+
+## Features
+- 40+ integrated security tools
+- Integrated VTE terminal
+- Dark theme UI
+- Keyboard shortcuts
+
+## Tool Categories
+- Network: Wireshark, Nmap, Burp Suite
+- Crypto: Hashcat, John the Ripper
+- Wireless: Aircrack-ng, Kismet
+- OSINT: Maltego, theHarvester
+- Exploitation: Metasploit, SQLMap
+- Forensics: Autopsy, Volatility