doc: Add DeepWiki badge to README

Added DeepWiki badge to README for enhanced visibility.

Author: Ariestar

README.md

@@ -4,7 +4,7 @@
 
 **Drag and drop any block to rearrange content in Obsidian — just like Notion.**
 
-![Obsidian](https://img.shields.io/badge/Obsidian-%3E%3D1.0.0-7c3aed?logo=obsidian&logoColor=white) ![License](https://img.shields.io/github/license/Ariestar/obsidian-dragger) ![Release](https://img.shields.io/github/v/release/Ariestar/obsidian-dragger)
+![Obsidian](https://img.shields.io/badge/Obsidian-%3E%3D1.0.0-7c3aed?logo=obsidian&logoColor=white) ![License](https://img.shields.io/github/license/Ariestar/obsidian-dragger) ![Release](https://img.shields.io/github/v/release/Ariestar/obsidian-dragger) [![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/Ariestar/obsidian-dragger)
 
 ![gif](https://github.com/user-attachments/assets/bfb3ac7d-7dfe-4c24-a428-5d08b49d0654)