docs: add llms.txt

llms.txt

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+# dpi-frag
+
+> Local SOCKS5 proxy in C++ that splits the TLS ClientHello across multiple TCP segments so SNI-based DPI can't pattern-match the domain in one packet.
+
+Written for Windows, built with CMake and MSVC. No raw sockets, no drivers, works at the application/socket layer only.
+
+## Docs
+
+- [README](https://github.com/ImSavsis/dpi-frag/blob/master/README.md): build and usage instructions, architecture diagram
+- [src/main.cpp](https://github.com/ImSavsis/dpi-frag/blob/master/src/main.cpp): SOCKS5 handshake and relay logic
+- [src/sni_split.cpp](https://github.com/ImSavsis/dpi-frag/blob/master/src/sni_split.cpp): TLS ClientHello parser that finds the SNI split point
+
+## Notes
+
+- Not a VPN, does not encrypt traffic
+- Does not help against IP-based blocking, only SNI-based