Update README.md

Author: yushulx

examples/official/README.md

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 # Dynamsoft Capture Vision SDK for Document Detection
 This repository contains example code for using the Dynamsoft Capture Vision SDK to detect documents in images.
 
+https://github.com/user-attachments/assets/1d93597e-45f0-487f-a946-8f6dbcda9b07
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 ## Prerequisites
 - [Dynamsoft Capture Vision Trial License](https://www.dynamsoft.com/customer/license/trialLicense/?product=dcv&package=cross-platform)
 
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     pip install -r requirements.txt
     ```
 
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+## Supported Platforms
+- Windows
+- Linux
+- macOS
 
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