docs: update README — add helm-charts/proto repos, helm install instructions

Author: mahmut-Abi

README.md

@@ -12,11 +12,13 @@ Nantian Gateway provides a split-plane architecture for Kubernetes Gateway API.
 The project is organized across three sibling repositories:
 
 | Repository | Description |
-|---|---|
-| **nantian-gw/nantian-gw** (this repo) | Go control plane, proto contract, deploy configs, tests, docs |
+|---|---|---|
+| **nantian-gw/nantian-gw** (this repo) | Go control plane, deploy configs, tests, docs |
 | **nantian-gw/dataplane** | Rust data plane (HTTP/stream proxy runtime, xDS client, AI gateway, Wasm plugins) |
 | **nantian-gw/dashboard** | Next.js/React admin console and Node proxy server |
 | **nantian-gw/website** | Project website and documentation site |
+| **nantian-gw/helm-charts** | Helm charts for Kubernetes deployment |
+| **nantian-gw/proto** | Shared protobuf contract between control plane and data plane |
 
 ## Architecture
 
@@ -72,7 +74,12 @@ For a quick trial with Kind:
 For longer-running environments:
 
 ```bash
+# Kustomize
 kubectl apply -k deploy/kubernetes/overlays/production
+
+# Helm
+helm repo add nantian-gw https://nantian-gw.github.io/helm-charts
+helm install nantian-gw nantian-gw/nantian-gw --namespace nantian-gw --create-namespace
 ```
 
 See `docs/user/getting-started.md` and `deploy/README.md` for detailed setup instructions.