docs: add README with quick start and docs links

Co-Authored-By: Virgil <virgil@lethean.io>

README.md

@@ -0,0 +1,43 @@
+# go-p2p
+
+P2P mesh networking layer for the Lethean network. Provides Ed25519 node identity, an encrypted WebSocket transport with HMAC-SHA256 challenge-response handshake, KD-tree peer selection across four dimensions (latency, hops, geography, reliability score), UEPS wire protocol (RFC-021) TLV packet builder and reader, UEPS intent routing with a threat circuit breaker, and TIM deployment bundle encryption with Zip Slip and decompression-bomb defences.
+
+**Module**: `forge.lthn.ai/core/go-p2p`
+**Licence**: EUPL-1.2
+**Language**: Go 1.25
+
+## Quick Start
+
+```go
+import (
+    "forge.lthn.ai/core/go-p2p/node"
+    "forge.lthn.ai/core/go-p2p/ueps"
+)
+
+// Start a P2P node
+identity, _ := node.LoadOrCreateIdentity()
+transport := node.NewTransport(identity, node.TransportConfig{ListenAddr: ":9091"})
+transport.Start(ctx)
+
+// Build a UEPS packet
+pkt, _ := ueps.NewBuilder(ueps.IntentCompute, payload).MarshalAndSign(sharedSecret)
+```
+
+## Documentation
+
+- [Architecture](docs/architecture.md) — node identity, transport, peer registry, UEPS protocol, dispatcher
+- [Development Guide](docs/development.md) — building, testing, benchmarks, security rules
+- [Project History](docs/history.md) — completed phases and known limitations
+
+## Build & Test
+
+```bash
+go test ./...
+go test -race ./...
+go test -short ./...   # skip integration tests
+go build ./...
+```
+
+## Licence
+
+European Union Public Licence 1.2 — see [LICENCE](LICENCE) for details.