Empty EditorConfig files clarification

[mipo256]

We do not mention explicitly in the doc whether an empty .editorconfig file is a valid .editorconfig file. I think, regarding the backward compatibility in mind, it should be allowed and considered a valid .editorconfig file with no sections and root = false by default.

[mipo256]

What are your thoughts on this, @xuhdev ?

[xuhdev]

Yeah I agree, we can add one sentence about it.