Created a Simplified Chinese version of README introduction

[maxtan1999]

Created a Simplified Chinese version of README introduction

https://github.com/maxtan1999/tree-sitter-legesher-python/blob/master/README.zh-cn.md

This pull request (PR) is made in reference to: https://github.com/legesher/tree-sitter-legesher-python/blob/master/README.md

[welcome[bot]]

💖 Thanks for opening this pull request! 💖

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• fix: don't overwrite prevent_default if default wasn't prevented
• feat: add app.isPackaged() method
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