chore: first project structure

README.md

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+# softlan-vpn
+
+Monorepo for a Layer 2 over QUIC LAN party bridge.
+
+## Workspace crates
+
+- `lanparty-proto`: shared frame format, MAC validation, MTU helpers.
+- `lanparty-ctrl`: control-plane messages (join/hello/role/version).
+- `lanparty-obs`: shared diagnostics/logging event models.
+- `lanparty-client-core`: platform-agnostic client session state.
+- `lanparty-client-win`: Windows TAP + route/metric handling binary.
+- `lanparty-gateway`: Linux AF_PACKET gateway binary.
+- `lanparty-relay`: public QUIC relay binary.
+
+## Build
+
+```bash
+cargo check --workspace
+```