Add .gitattributes for standardized line endings

[Ste1io]

The repository currently lacks a .gitattributes file. This omission likely was the cause of, or at least contributed to the problems encountered in issue #503, which seem to be related to inconsistent line endings across different development environments.

Introducing a .gitattributes will help standardize line endings (LF/CRLF) for all contributors, regardless of their OS, and should prevent similar issues in the future.