translation: add Chinese translation for servant design pattern

[jerryyummy]

translation: translation of servant pattern to chinese https://github.com/iluwatar/java-design-patterns/issues/2289

This pull request adds the Chinese translation of the README.md for the servant pattern, which explains the pattern itself.

Created a new README.md file in zh with the translation of the English README.md. Checked for grammar and spelling errors in the translation.

For detailed contributing instructions see https://github.com/iluwatar/java-design-patterns/wiki/01.-How-to-contribute

For detailed contributing instructions see https://github.com/iluwatar/java-design-patterns/wiki/01.-How-to-contribute

[jerryyummy]

hey, can you review it?

[sonarqubecloud[bot]]

Quality Gate passed

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[iluwatar]

The changes look good. I'm sorry @jerryyummy that the review took too long. I'm happy to merge if you open another PR.