Clarify how to contribute

[JAGulin]

Machine translation from English:
@xxxily Thank you for providing this plugin. I found it by chance and it is useful. I see that you do active development, and there is a large community (over 800 stars and 100 forks on GitHub). Are you open to involving the community as contributors? Not many of the forks seem to have provided back. Clarifying how to contribute may strengthen the development. I hope you don't mind users engaging.

From the issue section there are some recurring problems mentioned. I'm considering to contribute towards the shortcut key configuration. Would you want to discuss the possibilities first?

Before starting any bigger work, I had to get overview of the project setup and style. I think I have the picture clearer, and have started writing instructions to help others wanting to contribute. This could be the CONTRIBUTE file, but could you clarify LICENSE for the project? GreasyFork says GPL, but I don't know if that apply to (everything in) the git.
I wasn't able to find the base project you mention in README. Is it still relevant in terms of licensing?

Another thing we should clarify is acceptable language. From reading the code I see comments in Chinese, but I also get the impression that you are ok with English. Is it ok to write English here in the forum, is it better if the user also adds a machine translation? In the code I would prefer English as the main language, but totally respect if that isn't as convenient.

As a first proposal, I created #271 and would welcome any discussion about that in the issue, and anything more general about contributions here. Thank you!

英文機器翻譯：
@xxxily 感謝您提供此插件。我偶然發現它，它很有用。我看到你在積極開發，並且有一個龐大的社區（GitHub 上有 800 多個星和 100 個分支）。您願意讓社區作為貢獻者參與嗎？似乎沒有多少叉子提供回來。明確如何貢獻可以加強發展。我希望你不介意用戶參與。

從問題部分提到了一些反復出現的問題。我正在考慮為快捷鍵配置做出貢獻。您想先討論一下可能性嗎？

在開始任何更大的工作之前，我必須了解項目設置和風格。我想我的圖片更清晰，並且已經開始編寫說明來幫助其他想要做出貢獻的人。這可能是 CONTRIBUTE 文件，但您能否澄清 [許可證](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-license-to -a-repository) 用於項目？ GreasyFork 說 GPL，但我不知道這是否適用於（所有）git。
我無法找到您在自述文件中提到的 基礎項目。它在許可方面仍然相關嗎？

我們應該澄清的另一件事是可接受的語言。通過閱讀代碼，我看到了中文註釋，但我也覺得你對英語沒問題。論壇裡寫英文可以嗎，如果用戶也加個機器翻譯是不是更好？在代碼中，我更喜歡英語作為主要語言，但如果不那麼方便，完全尊重。

作為第一個提案，我創建了 #271，並歡迎在該問題中對此進行任何討論，以及任何關於此處貢獻的更一般性的內容。謝謝！