add Mandarin overview

[kj-huang]

I translate the overview page from English into Mandarin

[codecov-io]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is n/a.

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##           master    #17   +/-   ##
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  Coverage     100%   100%           
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  Files          76     76           
  Lines        1596   1596           
  Branches      282    282           
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  Hits         1596   1596

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[trekhleb]

@mybaseball52 Great! Thank you for submission!

[trekhleb]

@mybaseball52
Sorry, I've just noticed that there is still a lot of English text presented, like "Below is the list of some of the most used Big O notations..." and others. Could you please do complete translation as it is done here https://github.com/trekhleb/javascript-algorithms/blob/master/README.zh-CN.md ?

[kj-huang]

Yes, I’m still working on it! Oleksii Trekhleb <[email protected]>於 2018年5月25日 週五，下午12:54寫道：

…

@mybaseball52 <https://github.com/mybaseball52> Sorry, I've just noticed that there is still a lot of English text presented, like "Below is the list of some of the most used Big O notations..." and others. Could you please do complete translation as it is done here https://github.com/trekhleb/javascript-algorithms/blob/master/README.zh-CN.md ? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#17 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AMVitSpE5RkNWwlNpFNkG-7dLcPREmZQks5t145igaJpZM4UNUKo> .

[trekhleb]

@mybaseball52 Thank you! Waiting forward to see you next pull request

[kj-huang]

But I think I will still translate into xD-TW because there is many people in Taiwan didn’t read simplified Chinese, so I translate into where? Oleksii Trekhleb <[email protected]>於 2018年5月25日 週五，下午12:57寫道：

…

@mybaseball52 <https://github.com/mybaseball52> Thank you! Waiting forward to see you next pull request — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#17 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AMVitY-voLT-btsuIl0uk944huHNcR_Mks5t148bgaJpZM4UNUKo> .

[trekhleb]

Yes, sure, create a new README.zh-TW.md and put your translation there.