Add a .gitattributes file to avoid problems with diffs in windows

[miguelangeltorresfp]

This is my first pull request ever !

This is the link to this file in the material-ui repo: link

The official doc:
link

Anyway I just detected other incompatibilities with the Windows system in the package.json file:

• For inline declaration of env variables it would have to use the cross-env package:
  "compile:esm": "cross-env BABEL_ENV=esm npm run compile -- --out-dir dist/esm",

• And the rsync command is not compatible either.

[alex996]

Thanks for your contribution and congrats on the first PR!

Looks like you nailed it by setting both text and eol. This is recommended by prettier since they switched from auto to lf in v2.0.0 as the default line ending, and is confirmed by repos like gatsbyjs/gatsby. I noticed facebook/react uses * text=auto but that's likely because they're still on prettier v1.19.1.

As far as other incompat, all are valid points. Right off the bat, the following can be improved:

• rm -rf => rimraf
• BABEL_ENV=esm => cross-env BABEL_ENV=esm (like you pointed out)
• rsync => cpx (mysticatea/cpx or something similar)
• "eslint '**/*.{js,ts,tsx}'" => "eslint \"**/*.{js,ts,tsx}\""

Not too worried though since I'm always on Linux when publishing, but I'd welcome any PRs.