Add UOS AI Docs (#360)

docs/UOS AI/README.md

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+___
+
+![image](assets/uos-ai-assistant.svg)
+
+___
+
+# [UOS AI](https://www.deepin.org)
+
+UOS AI is a powerful AI assistant application within the Deepin operating system. 
+
+It offers unique cross-application capabilities, enabling deep integration with built-in email and browser applications, providing you with contextualized AI capabilities.
+
+# UI
+
+![image](assets/ui-en.png)
+
+## Integrate with DeepSeek API
+
+## Default Option
+
+1. Open the "Settings" option in UOS AI, select "DeepSeek-R1" in the "Model Configuration" under "Online model-Add" to enter the UOS AI model addition interface.
+
+2. Select "DeepSeek-R1" in the "LLM".
+
+3. Fill in any name in the "Account".
+
+4. Enter your API key in the "APIKey".
+
+![image](assets/r1-en.png)
+
+## Custom Option
+
+1. Select "Custom" in the "LLM".
+2. Enter any name you like in the "Account".
+3. Enter your API key in the "APIKey".
+4. Add the name of the model you want to use in the "Model Name".
+   -  For DeepSeek-V3, enter: deepseek-chat
+   - For DeepSeek-R1, enter: deepseek-reasoner
+5. Enter the following request address to "Domain": https://api.deepseek.com/chat/completions
+
+![image](assets/custom-v3-en.png)