Add git line-ending config for Windows

[kayhadrin]

• Avoids having git detect lots of modified files on Windows due to CR/LF EOL differences.

[cpojer]

.gitattributes like this should be a global config on your computer, not part of the repo. Alternatively, I recommend using WLS.

[kayhadrin]

I know it can be configured globally, and I already use the WSL, but my git repo files still get checked out with CR/LF for some reason; I suspect it's because I used VS Code's git extension to checkout the repo instead of doing it from the WSL CLI. (I.e. VS Code checked out the files onto a "C:.." drive location)
Personally, I think it would reduce friction to have that config file in the repo instead of expecting everyone to already have the right environment setup.