Update README with development and publishing guidelines

Added development and publishing instructions for GitHub Pages, including branching model, local development steps, production build commands, and deployment details.

Author: xiboliaren

README.md

@@ -1,2 +1,33 @@
 # gts-web
 GTS Website source code
+
+## Development & Publishing (GitHub Pages)
+
+This website is a Vite/React static site deployed to **GitHub Pages**.
+
+### Branching model
+
+- Make changes in a **feature branch** (e.g. `feature/my-change`)
+- Open a Pull Request into `main`
+- After review, **merge to `main`**
+- Every push/merge to `main` triggers the **GitHub Actions Pages deployment** automatically
+
+### Local development
+
+```bash
+npm ci
+npm run dev
+```
+
+### Production build (local verification)
+
+```bash
+npm run build
+npm run preview
+```
+
+### Deployment
+
+Deployment is automated via GitHub Actions:
+- On push to main, the workflow builds the site and publishes the dist/ folder to GitHub Pages.
+- The custom domain is globaltypesystem.org.