Docs: Add Block Styles Readme

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

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+
+# Block Styles 
+
+This `BlockStyles` component displays available block styles in the Settings Sidebar, allowing users to preview and switch between them.
+
+
+## Table of contents
+
+1. [Development guidelines](#development-guidelines)
+2. [Related components](#related-components)
+
+
+## Development guidelines
+
+### Usage
+```jsx
+import { BlockStyles } from '@wordpress/block-editor';
+
+const MyBlockStyles = () => (
+    <BlockStyles
+        clientId="block_123"
+        onSwitch={ ( styleName ) => {
+            // Handle style switch
+        } }
+        onHoverClassName={ ( styleName ) => {
+            // Handle hover class name
+        } }
+    />
+);
+```
+
+### Props
+
+### `clientId`
+
+**Type**: `string`
+
+The block client ID.
+
+### `onSwitch`
+
+**Type**: `Function`
+**Default**: noop
+
+A function that is called when a block style is selected.
+
+### `onHoverClassName`
+
+**Type**: `Function`
+**Default**: noop
+
+A function that is called when a block style is hovered.
+
+## 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.