docs: update README

Closes #1

README.md

@@ -1,13 +1,23 @@
 # @types\_\_carbon-icons-react
 
-> Generate source code for `@types/carbon__icons-react`
+> Generate source code for [@types/carbon\_\_icons-react](https://www.npmjs.com/package/@types/carbon__icons-react)
+
+This repo generates TypeScript definitions for the [@carbon/icons-react](https://github.com/carbon-design-system/carbon/tree/main/packages/icons-react) icon library using the [@carbon/icons](https://www.npmjs.com/package/@carbon/icons) package.
+
+## Prerequisites
+
+This repo uses `bun`. See the docs for [installation instructions](https://bun.sh/docs/installation).
 
 ## Runbook
 
-1. Upgrade `@carbon/icons`.
+1. Manually upgrade the minor version of `@carbon/icons`.
 2. Run `bun generate-types`.
-3. Copy files from `dist/` to DefinitelyTyped.
 
-## License
+- This will generate the source code in `dist/`.
+- If there are changes, the `tests/index.test.ts` should expectedly fail. Fix the broken test and commit the changes.
+
+If there are changes, perform the following steps to update the type definitions:
 
-[MIT](LICENSE)
+1. Fork https://github.com/DefinitelyTyped/DefinitelyTyped.
+2. Create a new branch (e.g., `carbon-icons-react-<version>`).
+3. Copy the generated files from `dist/` to `DefinitelyTyped/types/carbon__icons-react`.