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CONTRIBUTING.md

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+# Contributing
+
+- [Setup](#setup)
+- [Creating new themes](#creating-new-themes)
+- [Adding localizations](#adding-localizations)
+
+Thanks for considering to contribute!
+
+## Setup
+
+To contribute to NotionNext, follow these steps:
+
+1. [Fork][fork] the repository to your GitHub account.
+2. Clone the repository to your device (or use something like Codespaces).
+3. Create a new branch in the repository.
+4. Make your modifications.
+5. Commit your modifications and push the branch.
+6. [Create a PR][pr] from the branch in your fork to NotionNext' `main` branch.
+
+This project is built with [Next.js][next.js] and `yarn` as the package manager.
+Here are some commands that you can use:
+
+- `yarn`: install dependencies
+- `yarn dev`: compile and hot-reload for development
+- `yarn build`: compile and minify for production
+- `yarn start`: serve the compiled build in production mode
+
+## Creating new themes
+
+If you want to submit your custom theme to NotionNext, copy a new folder in
+[`themes`][themes-dir] from [`example`][example]. The folder name  will be the
+theme's key. 
+
+## Adding localizations
+
+If your language is not yet supported by NotionNext, please contribute a
+localization! Follow these steps to add a new localization:
+
+1. Copy one of the [en-US.js][en-US.js] in [lang-dir][lang-dir] and rename the new
+   directory into your language's code ( e.g. `zh-CN.js`).
+2. Start translating the strings.
+3. Add your language config to [lang.js][lang.js]. 
+4. [Create a PR][pr] with your localization updates.
+
+[fork]: https://github.com/tangly1024/NotionNext/fork
+[pr]: https://github.com/tangly1024/NotionNext/compare
+[next.js]: https://github.com/vercel/next.js
+[themes-dir]: themes
+[example]: themes/example
+[lang-dir]: lib/lang
+[en-US.js]: lib/lang/en-US.js
+[lang.js]: lib/lang.js