Add Chinese localization guidance

[lizy-coding]

Summary

This PR adds Chinese localization guidance to help Chinese-speaking users better understand how to use and contribute to the project.

Changes

• Added Chinese localization guidance
• Improved accessibility for Chinese-speaking contributors
• Clarified localized documentation usage and contribution expectations

Motivation

Chinese-speaking users may need clearer localized guidance when reading, using, or contributing to this project. This update improves documentation accessibility and lowers the barrier for participation.

Testing

• Documentation-only change
• No code changes

[gemini-code-assist]

Code Review

This pull request updates the Flutter localization guide to include workflows and examples for Chinese localization, including adding Chinese ARB files and configuring Chinese locales. The reviewer suggested keeping the Spanish locale in the example configuration to maintain consistency with other sections of the guide that still reference Spanish localization.

[lizy-coding]

Add Chinese localization

[johnpryan]

Thanks for sending a pull request, this adds a lot of instructions that are specific to adding localization for chinese, but this skill is meant to be a general-purpose skill for adding localization in any language.

Can you help me understand what steps you were trying to take that required you to modify this skill? Is there a way to generalize these instructions for other languages too?