docs: add Techcombank to users

[tuananh]

Signed-off-by: Tuan Anh Tran me@tuananh.org

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e343d3b). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #10085   +/-   ##
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  Coverage          ?   45.89%           
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  Files             ?      227           
  Lines             ?    27353           
  Branches          ?        0           
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  Hits              ?    12555           
  Misses            ?    13095           
  Partials          ?     1703           

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[crenshaw-dev]

lgtm, thanks @tuananh!