Initial commit of medusajs v2 rc2

src/admin/README.md

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+# Admin Customizations
+
+You can extend the Medusa Admin to add widgets and new pages. Your customizations interact with API routes to provide merchants with custom functionalities.
+
+## Example: Create a Widget
+
+A widget is a React component that can be injected into an existing page in the admin dashboard.
+
+For example, create the file `src/admin/widgets/product-widget.tsx` with the following content:
+
+```tsx title="src/admin/widgets/product-widget.tsx"
+import { defineWidgetConfig } from "@medusajs/admin-sdk"
+
+// The widget
+const ProductWidget = () => {
+  return (
+    <div>
+      <h2>Product Widget</h2>
+    </div>
+  )
+}
+
+// The widget's configurations
+export const config = defineWidgetConfig({
+  zone: "product.details.after",
+})
+
+export default ProductWidget
+```
+
+This inserts a widget with the text “Product Widget” at the end of a product’s details page.