[add] add ruzhi ai note to app list (#275)

Co-authored-by: wangfu@dingtalk.com <wangfu@dingtalk.com>

docs/ruzhiai_note/README.md

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+<div align="center">
+<img src="./assets/play_store_512.png" width="64" height="auto" />
+</div>
+
+# RuZhi AI Notes
+
+RuZhi AI Notes is an intelligent AI knowledge management tool dedicated to providing users with one-stop knowledge management and application services, including AI search and exploration, AI results to notes conversion, note management and organization, knowledge presentation and sharing, etc.
+
+## Core Advantages
+
+### 1. Powerful AI Model Support
+- Integrated with DeepSeek thinking model
+- According to user feedback, compared to similar products, our model:
+  - More stable
+  - Higher output quality
+  - Can integrate with enterprise internal knowledge bases
+
+<img src="./assets/deepseek_used.jpg" width="100%" height="auto" />
+
+### 2. Convenient Content Management
+- One-click save AI conversation content to notes
+- Support for various export formats:
+  - Markdown
+  - Word documents
+  - PDF files
+  - PPT presentations
+  - Resume templates
+  and more formats
+
+### 3. Upcoming Features
+- Task management list
+- To-do tracking
+- Calendar management
+- More intelligent features
+- Multi-platform clients
+
+## Usage Guide
+
+#### Method 1: Search
+1. Search for "RuZhi AI Notes" in search engines
+2. Register
+
+#### Method 2: Direct Link Access
+1. Visit our official link https://ruzhiai.perfcloud.cn/
+2. Complete the registration process
+   - The system will automatically create an application for you after registration
+   - You can then start using all features