feat: add .editorconfig and .gitattributes for consistent file formatting

[ChuckieChen945]

close #327

[davebulaval]

Thanks for the contribution @ChuckieChen945! 🙏

We identified a few issues with this PR:

1. Wrong directory: Files are placed in template/ but our cookiecutter template directory is {{ cookiecutter.__project_name_kebab_case }}/
2. .editorconfig already exists: The template already has one — this would create a duplicate in the wrong location
3. max_line_length: Set to 88 but our Baseline convention uses 99

We've incorporated the good parts of your contribution (especially .gitattributes) with the necessary fixes in #28.

Thanks again for the idea — the .gitattributes addition is a great improvement!

[ChuckieChen945]

We've incorporated the good parts of your contribution (especially .gitattributes) with the necessary fixes in #28.

In addition, this PR has been absorbed by Baseline-quebec/baseline-app-cookiecutter here:
Baseline-quebec#28 , not #28