Add traditional Chinese README

[akamayu-ouo]

What is it?

• Bugfix (user facing)
• Feature (user facing)
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

Add traditional Chinese translation of README.md

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR.

Due diligence

• I read the contribution guidelines.

[triallax]

Thanks for the PR! I'm not sure about the spans you've added to the README; I think that's a pretty good idea, but I'll wait for others' opinions on this.

[litetex]

Thanks for the PR! I'm not sure about the spans you've added to the README; I think that's a pretty good idea, but I'll wait for others' opinions on this.

I think those are for links which jump to the corresponding section of the document.

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Note: ⚠️ This PR should be squash merged.

_{In my opinion it's also kind of hilarious that there is no French or German Readme - despite the fact that most of the dev-team speaks those languages}

[opusforlife2]

Thank you for the contribution!