All git repositories must have an .editorconfig file at the root.
As much as possible, we should use .editorconfig (rather than other configuration files) to specify our preferred coding styles.
The top of the .editorconfig file should look like this:
root = true
[*]
charset = utf-8
end_of_line = lf
indent_size = 2
indent_style = space
insert_final_newline = true
trim_trailing_whitespace = true
These settings make good defaults. Extension-specific settings can follow in their own sections.