added README

README.md

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+# Universal Bypass Tool
+
+Network stack research tool. TCP tunnel with pluggable transports.
+
+```
+Client (SOCKS5) --> Transport (Yandex Docs WS) --> Exit Node --> Internet
+```
+
+## What it does
+
+Sends TCP packets through Yandex Docs cursor messages. Client side runs a SOCKS5 proxy, exit node decapsulates and forwards to real internet.
+
+## Structure
+
+```
+openflux/
+├── main.go
+├── transport/
+│   ├── transport.go      # Transport interface
+│   └── yandex/           # Yandex Docs backend
+├── tunnel/
+│   ├── tunnel.go         # TCP tunnel core
+│   ├── endpoint.go       # Virtual NIC
+│   └── rawsocket.go      # Raw socket (exit node)
+├── socks5/               # SOCKS5 server
+├── network/              # Checksums, packet parsing
+└── utils/                # Debug logging
+```
+
+## Build
+
+```bash
+go mod tidy
+go build -o openflux .
+```
+
+## Usage
+
+Exit node (needs root):
+```bash
+sudo iptables -A OUTPUT -p tcp --tcp-flags RST RST -j DROP
+sudo ./openflux --exit-node --url "YOUR_YANDEX_DOC_URL" --debug
+```
+
+Client:
+```bash
+./openflux --client --url "YOUR_YANDEX_DOC_URL" --socks5 :1080 --debug
+```
+
+Then point your browser to SOCKS5 proxy at localhost:1080.
+
+## Flags
+
+| Flag | Default | Description |
+|------|---------|-------------|
+| `--client` | | Run as client |
+| `--exit-node` | | Run as exit node |
+| `--url` | `https://localhost` | Document URL |
+| `--socks5` | `:1080` | SOCKS5 listen addr |
+| `--debug` | `false` | Verbose logging |
+| `--transport` | `yandex` | Transport backend |
+
+## Adding new transports
+
+Implement the `Transport` interface from `transport/transport.go`, add your package, register in main.go switch.
+
+## License
+
+Educational use only. Test on your own machines and networks.
+