Fix #1972, Add zsh completion script #2031
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I create a zsh completion script. However, A better solution is use a data structure to store option information, like https://github.com/TeX-Live/texdoc/blob/master/script/texdoclib-const.tlu#L77-L260,
then generate help message and shell completion from a template: https://github.com/TeX-Live/texdoc/blob/master/script/texdoclib-const.tlu#L30-L51, https://github.com/TeX-Live/texdoc/blob/master/script/texdoclib-const.tlu#L53-L75. But I am not very familiar with C. 😢 So if anyone want to this solution, they can use this file as a template.