Add Kustomize.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-kubernetes/Kustomize.md

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+
+
+# Kustomize Setup for Kubernetes
+
+Kustomize allows you to customize Kubernetes YAML configurations.
+
+## Prerequisites
+
+- Kubernetes cluster is set up.
+- Kustomize is installed.
+
+## Steps
+
+1. **Clone the Open WebUI Manifests:**
+
+   ```bash
+   git clone https://github.com/open-webui/k8s-manifests.git
+   cd k8s-manifests
+   ```
+
+2. **Apply the Manifests:**
+
+   ```bash
+   kubectl apply -k .
+   ```
+
+3. **Verify Installation:**
+
+   ```bash
+   kubectl get pods
+   ```
+
+## Access the WebUI
+
+Set up port forwarding or load balancing to access Open WebUI from outside the cluster.