docs: command usage and license

README.md

@@ -1,3 +1,24 @@
 # c13n
 The newsletter of Computerization.
 
+## Commands
+
+We use `pnpm` as `c13n`'s package manager. Please avoid the usage of `npm` command.
+
+| Command                    | Action                                           |
+|:---------------------------| :----------------------------------------------- |
+| `pnpm install`             | Installs dependencies                            |
+| `pnpm run dev`             | Starts local dev server at `localhost:4321`      |
+| `pnpm run dev:network`     | Starts local dev server on local network         |
+| `pnpm run sync`            | Generates TypeScript types for all Astro modules.|
+| `pnpm run build`           | Build your production site to `./dist/`          |
+| `pnpm run preview`         | Preview your build locally, before deploying     |
+| `pnpm run preview:network` | Preview build on local network                   |
+| `pnpm run astro ...`       | Run CLI commands like `astro add`, `astro check` |
+| `pnpm run astro -- --help` | Get help using the Astro CLI                     |
+| `pnpm run lint`            | Run ESLint                                       |
+| `pnpm run lint:fix`        | Auto-fix ESLint issues                           |
+
+## License
+
+MIT for source code, CC BY 4.0 for texts.