add endline rule

[guMcrey]

env: node\r no such file or directory
https://stackoverflow.com/questions/30344858/node-script-executable-not-working-on-mac-env-node-r-no-such-file-or-directo

.gitattributes
https://docs.github.com/zh/get-started/getting-started-with-git/configuring-git-to-handle-line-endings?platform=mac

yarn:
yarnpkg/yarn#5480

[codecov-commenter]

Codecov Report

Merging #27 (600d7ef) into main (5dfa2da) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   97.56%   97.56%           
=======================================
  Files           2        2           
  Lines          82       82           
  Branches       17       17           
=======================================
  Hits           80       80           
  Misses          2        2           

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