Add .gitattributes

[Goooler]

• Add .gitattributes, document here.

[yschimke]

What's the benefit of this PR? A windows developer won't get annoyed with random line ending changes?

[Goooler]

What's the benefit of this PR? A windows developer won't get annoyed with random line ending changes?

For example, if I execute gradlew wrapper in Windows, the Windows's default eol is crlf, will chnage the gradlew file, lead to it can't be executable.

[yschimke]

Is this standard in gradle projects? or cashapp/square projects? I'd push back on extra config that makes any project special.

[Goooler]

Is this standard in gradle projects? or cashapp/square projects? I'd push back on extra config that makes any project special.

See eslint-plugin-square's, gradle's.