feat: gatsby source medusa (#924)

packages/gatsby-source-medusa/README.md

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+<p align="center">
+  <a href="https://www.medusa-commerce.com">
+    <img alt="Medusa" src="https://user-images.githubusercontent.com/7554214/129161578-19b83dc8-fac5-4520-bd48-53cba676edd2.png" width="100" />
+  </a>
+</p>
+<h1 align="center">
+  gatsby-source-medusa
+</h1>
+<p align="center">
+Medusa is an open-source headless commerce engine that enables developers to create amazing digital commerce experiences. This is a Gatsby source plugin for building websites using Medusa as a data source.
+</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://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://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>
+
+## Note
+
+This plugin is still under development. Please report any issues or suggestions on the GitHub issues page.
+
+## Quickstart
+
+This takes you through the minimal steps to see your Medusa data in your Gatsby site's GraphiQL explorer.
+
+### 1. Installation
+
+Install the source plugin to your Gatsby project using your favorite package manager.
+
+```shell
+npm install gatsby-source-medusa
+```
+
+```shell
+yarn add gatsby-source-medusa
+```
+
+### 2. Configuration
+
+Add the plugin to your `gatsby-config.js`:
+
+```js:title=gatsby-config.js
+require("dotenv").config()
+
+module.exports = {
+  plugins: [
+    {
+      resolve: "gatsby-source-medusa",
+      options: {
+        storeUrl: process.env.MEDUSA_URL,
+        authToken: process.env.MEDUSA_AUTH_TOKEN //This is optional
+      },
+    },
+    ...,
+  ],
+}
+```
+
+The plugin accepts two options `storeUrl` and `authToken`. The `storeUrl` option is required and should point to the server where your Medusa instance is hosted (this could be `localhost:9000` in development). The `authToken` option is optional, and if you add it the plugin will also source orders from your store.
+
+## You should now be ready to begin querying your data
+
+You should now be able to view your stores `MedusaProducts`, `MedusaRegions`, `MedusaCollections`, and `MedusaOrders` (if enabled) in your Gatsby site's GraphiQL explorer.