📝 Add contributors section.

Author: AlexV525

README.md

@@ -13,6 +13,20 @@ Language: English | [中文简体](README-ZH.md)
 
 An **assets picker** which looks like the one in WeChat, based on `photo_manager` for asset implementation, `extended_image` for image preview, `provider` to help controlling the state of the picker.
 
+## Contributors ✨
+
+Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
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+<!-- markdownlint-enable -->
+<!-- prettier-ignore-end -->
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
+
 ## Category 🗂
 
 * [Features](#features-)