docs: Add Getting Started section to root README

Author: eclopez

README.md

@@ -10,3 +10,9 @@ A starter kit for building a monorepo with Turborepo and pnpm.
 - `config/*`: Packages containing shared configurations for ESLint, TypeScript, and Vitest.
 - `packages/*`: Shared packages used across applications.
   - `/ui/`: A shared UI component library using React and Tailwind CSS.
+
+## Getting Started
+
+1. (optional) Rename the package namespace from `@starter` to your desired namespace in all files.
+2. Install dependencies by running `pnpm install` in the root directory.
+3. Start developing by running `pnpm dev` to launch the Next.js app, Storybook, and UI package.