docs(api): improve readme

packages/api/docs/README.md

@@ -1,5 +1,31 @@
 # Cookie Monster Dialog API
 
+## Installation
+
+Make sure you have [Node.js](https://nodejs.org/) (version 20.x) and [Yarn](https://yarnpkg.com/) installed.
+
+```bash
+yarn install
+```
+
+## Scripts
+
+### `yarn build`
+
+Removes the build directory and compiles TypeScript files.
+
+### `yarn dev`
+
+Starts the server in development mode with nodemon.
+
+### `yarn lint`
+
+Lints the codebase using ESLint.
+
+### `yarn start`
+
+Starts the API server instance in production mode.
+
 ## Contributing
 
 Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.