feat: add SKILL.md for TDengine Node.js connector development guidelines

[qevolg]

Description

Issue(s)

• Close/close/Fix/fix/Resolve/resolve: Issue Link

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.10%. Comparing base (40cf375) to head (98a1557).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #113   +/-   ##
=======================================
  Coverage   81.10%   81.10%           
=======================================
  Files          33       33           
  Lines        3271     3271           
  Branches      589      589           
=======================================
  Hits         2653     2653           
  Misses        473      473           
  Partials      145      145           

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