Added readme for insertor component

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

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+# Inserter
+
+The `Inserter` component provides a user interface for inserting blocks, patterns, and media into the block editor. It includes search functionality, categorized tabs, and preview capabilities.
+
+## Component Structure
+
+The Inserter consists of several key parts:
+- Block Types Tab: For inserting standard blocks
+- Patterns Tab: For inserting block patterns
+- Media Tab: For inserting media content
+- Search functionality across all content types
+- Preview panel for blocks and patterns
+
+![Inserter Interface](path-to-inserter-screenshot.png)
+
+## Development guidelines
+
+### Usage
+
+```jsx
+import { Inserter } from '@wordpress/block-editor';
+
+const MyInserter = () => (
+    <Inserter
+        rootClientId="unique-id"
+        onSelect={( blocks ) => {
+            // Handle block insertion
+        }}
+        showInserterHelpPanel
+    />
+);
+```
+
+### Props
+
+#### `rootClientId`
+- **Type:** `String`
+- **Default:** `undefined`
+- **Description:** The client ID of the block where new blocks will be inserted
+
+#### `onSelect`
+- **Type:** `Function`
+- **Description:** Callback invoked when a block or pattern is selected for insertion
+
+#### `showInserterHelpPanel`
+- **Type:** `Boolean`
+- **Default:** `false`
+- **Description:** Whether to show the help panel with block/pattern previews
+
+#### `__experimentalInsertionIndex`
+- **Type:** `Number`
+- **Description:** Specific position where blocks should be inserted
+
+#### `isAppender`
+- **Type:** `Boolean`
+- **Default:** `false`
+- **Description:** Whether the inserter is being used as an appender
+
+### Structure
+
+```jsx
+<Inserter
+    rootClientId={rootClientId}
+    onSelect={onSelect}
+    showInserterHelpPanel={true}
+    __experimentalInsertionIndex={2}
+    isAppender={false}
+>
+    {/* Inserter content */}
+</Inserter>
+```
+
+## Tabs
+
+### Blocks Tab
+Displays available blocks organized by category. Includes:
+- Most used blocks section
+- Block categories
+- Search functionality
+- Block preview on hover
+
+### Patterns Tab
+Shows available block patterns with:
+- Pattern categories
+- Pattern previews
+- Sync status filtering
+- Search functionality
+
+### Media Tab
+Provides access to media insertion with:
+- Media categories
+- Media preview
+- Upload capabilities
+- External media options
+
+## Related Components
+
+Block Editor components are components that can be used to compose the UI of your block editor. They should be used under a [`BlockEditorProvider`](https://github.com/WordPress/gutenberg/blob/HEAD/packages/block-editor/src/components/provider/README.md) in the components tree.