update README

Author: mkagenius

README.md

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 ```
 
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 ![gemini1](images/gemini1.png)
 
 ![gemini2](images/gemini2.png)
 
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 ### Option 4: Kiro by Amazon
 [Kiro](https://kiro.dev/blog/introducing-kiro/) is recently launched by Amazon.
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 }
 ```
 
-</details>
 
 ![kiro](images/kiro.png)
 
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 ## Security
 
 Code runs in an isolated container with VM-level isolation. Your host system and files outside the sandbox remain protected.