Docs: Add Image Editor component readme

packages/block-editor/src/components/image-editor/README.md

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+# Image Editor
+
+The Image Editor component is a component that allows the user to edit an image. It provides a set of tools to crop, rotate, flip, and resize the image.
+
+## Table of contents
+
+1. [Development guidelines](#development-guidelines)
+2. [Related components](#related-components)
+
+## Development guidelines
+
+### Usage
+
+Renders an image editor component.
+
+```jsx
+import { ImageEditor } from '@wordpress/block-editor';
+
+const MyImageEditor = () => (
+	<ImageEditor
+		id="image-editor"
+		url="https://example.com/image.jpg"
+		width={ 300 }
+		height={ 200 }
+		naturalHeight={ 300 }
+		naturalWidth={ 200 }
+		onSaveImage={ ( blob ) => {
+			// Handle the edited image.
+		} }
+		onFinishEditing={ () => {
+			// Handle the end of the editing.
+		} }
+		borderProps={ {
+			borderRadius: 10,
+			borderWidth: 2,
+			borderColor: 'red',
+		} }
+	/>
+);
+```
+
+### Props
+
+#### id
+
+-   Type: `string`
+-   Required: Yes
+
+The id of the image editor.
+
+#### url
+
+-   Type: `string`
+-   Required: Yes
+
+The URL of the image to edit.
+
+#### width
+
+-   Type: `number`
+-   Required: Yes
+
+The width of the image.
+
+#### height
+
+-   Type: `number`
+-   Required: Yes
+
+The height of the image.
+
+#### naturalHeight
+
+-   Type: `number`
+-   Required: Yes
+
+The natural height of the image.
+
+#### naturalWidth
+
+-   Type: `number`
+-   Required: Yes
+
+The natural width of the image.
+
+#### onSaveImage
+
+-   Type: `Function`
+-   Required: Yes
+
+A function that receives the edited image as a blob.
+
+#### onFinishEditing
+
+-   Type: `Function`
+-   Required: Yes
+
+A function that is called when the editing is finished.
+
+#### borderProps
+
+-   Type: `Object`
+-   Required: No
+
+An object with the border properties of the image.
+
+## Related components
+
+Block Editor components are components that can be used to compose the UI of your block editor. Thus, they can only be used under a [BlockEditorProvider](https://github.com/WordPress/gutenberg/blob/master/packages/block-editor/src/components/provider/README.md) in the components tree.