chore: add .gitignore setting for venv

[rewrite0w0]

Is your feature request related to a problem? Please describe.

It was inconvenient to manually commit files since there was no .gitignore configuration for the Python built-in venv environment.

Describe the solution you'd like

I propose adding .gitignore settings related to venv

Describe alternatives you've considered

Same as above.

Additional context

None

[dd-jy]

This issue has been fixed in PR #249.