docs: add local webserver testing section to readme

Co-authored-by: aider (openrouter/thinkingmachines/inkling-small:free) <aider@aider.chat>

README.md

@@ -50,3 +50,24 @@ This app provides a lightweight local interface to manage Kubernetes clusters vi
 - Keep frontend vanilla JS or minimal framework to stay lightweight
 - Consider running kubectl via subprocess with proper input validation
 - Add a simple status indicator for kubectl connectivity
+
+## Running Locally
+
+To test the app locally:
+
+1. Start the backend:
+   ```bash
+   cd backend
+   pip install -r requirements.txt
+   uvicorn main:app --reload --host 0.0.0.0 --port 8000
+   ```
+
+2. Serve the frontend (from the repo root or frontend folder):
+   ```bash
+   cd frontend
+   python -m http.server 8080
+   ```
+
+3. Open `http://localhost:8080` in your browser. The frontend connects to `http://localhost:8000` (CORS is enabled in the backend).
+
+Make sure `kubectl` is installed and configured with access to your cluster.