docs: add learntocode RPG (#44868)
docs: add learntocode RPG (#44868)

* docs: add learntocode RPG

* Update how-to-translate-files.md

* Update docs/how-to-translate-files.md

Co-authored-by: Eric Cheng <72ad06d696216a125f96cb7a88f3748a0f32d70e@gmail.com>

* Update how-to-translate-files.md

Co-authored-by: Lynn Zheng <f4ed7bc93dc44b820fc9b39af5ef9bb97b9fd587@outlook.com>
Co-authored-by: Eric Cheng <72ad06d696216a125f96cb7a88f3748a0f32d70e@gmail.com>
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