chore(): start moving some packages to the core directory (#7215)

packages/cli/create-medusa-app/README.md

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+<p align="center">
+  <a href="https://www.medusajs.com">
+    <img alt="Medusa" src="https://user-images.githubusercontent.com/7554214/153162406-bf8fd16f-aa98-4604-b87b-e13ab4baf604.png" width="100" />
+  </a>
+</p>
+<h1 align="center">
+  create-medusa-app
+</h1>
+
+<h4 align="center">
+  <a href="https://docs.medusajs.com">Documentation</a> |
+  <a href="https://www.medusajs.com">Website</a>
+</h4>
+
+<p align="center">
+An open source composable commerce engine built for developers.
+</p>
+<p align="center">
+  <a href="https://github.com/medusajs/medusa/blob/master/LICENSE">
+    <img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="Medusa is released under the MIT license." />
+  </a>
+  <a href="https://circleci.com/gh/medusajs/medusa">
+    <img src="https://circleci.com/gh/medusajs/medusa.svg?style=shield" alt="Current CircleCI build status." />
+  </a>
+  <a href="https://github.com/medusajs/medusa/blob/master/CONTRIBUTING.md">
+    <img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat" alt="PRs welcome!" />
+  </a>
+    <a href="https://www.producthunt.com/posts/medusa"><img src="https://img.shields.io/badge/Product%20Hunt-%231%20Product%20of%20the%20Day-%23DA552E" alt="Product Hunt"></a>
+  <a href="https://discord.gg/xpCwq3Kfn8">
+    <img src="https://img.shields.io/badge/chat-on%20discord-7289DA.svg" alt="Discord Chat" />
+  </a>
+  <a href="https://twitter.com/intent/follow?screen_name=medusajs">
+    <img src="https://img.shields.io/twitter/follow/medusajs.svg?label=Follow%20@medusajs" alt="Follow @medusajs" />
+  </a>
+</p>
+
+## Overview
+
+Using this NPX command, you can setup a Medusa backend and admin along with a PostgreSQL database in simple steps.
+
+---
+
+## Usage
+
+Run the following command in your terminal:
+
+```bash
+npx create-medusa-app@latest
+```
+
+Then, answer the prompted questions to setup your PostgreSQL database and Medusa project. Once the setup is done, the Medusa admin dashboard will open in your default browser.
+
+### Options
+
+| Option             | Description                                           | Default value                                        |
+|--------------------|-------------------------------------------------------|------------------------------------------------------|
+| `--repo-url <url>` | Create Medusa project from a different repository URL | `https://github.com/medusajs/medusa-starter-default` |
+| `--seed`           | Using this option seeds the database with demo data   | false                                                |