docs: add README with quick start and docs links

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

README.md

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+# go-store
+
+Group-namespaced SQLite key-value store with TTL expiry, namespace isolation, quota enforcement, and a reactive event system. Backed by a pure-Go SQLite driver (no CGO), uses WAL mode for concurrent reads, and enforces a single connection to ensure pragma consistency. Supports scoped stores for multi-tenant use, Watch/Unwatch subscriptions, and OnChange callbacks — the designed integration point for go-ws real-time streaming.
+
+**Module**: `forge.lthn.ai/core/go-store`
+**Licence**: EUPL-1.2
+**Language**: Go 1.25
+
+## Quick Start
+
+```go
+import "forge.lthn.ai/core/go-store"
+
+st, err := store.New("/path/to/store.db")  // or store.New(":memory:")
+defer st.Close()
+
+st.Set("config", "theme", "dark")
+st.SetWithTTL("session", "token", "abc123", 24*time.Hour)
+val, err := st.Get("config", "theme")
+
+// Watch for mutations
+w := st.Watch("config", "*")
+defer st.Unwatch(w)
+for e := range w.Ch { fmt.Println(e.Type, e.Key) }
+
+// Scoped store for tenant isolation
+sc, _ := store.NewScoped(st, "tenant-42")
+sc.Set("prefs", "locale", "en-GB")
+```
+
+## Documentation
+
+- [Architecture](docs/architecture.md) — storage layer, group/key model, TTL expiry, event system, namespace isolation
+- [Development Guide](docs/development.md) — prerequisites, test patterns, benchmarks, adding methods
+- [Project History](docs/history.md) — completed phases, known limitations, future considerations
+
+## Build & Test
+
+```bash
+go test ./...
+go test -race ./...
+go test -bench=. ./...
+go build ./...
+```
+
+## Licence
+
+European Union Public Licence 1.2 — see [LICENCE](LICENCE) for details.