Add .editorconfig file for basic formatting

EditorConfig is a specification to define the most basic code formatting
stuff, and it's supported by many editors and IDEs, either directly or
via plugins, including VSCode/VSCodium, Vim, emacs and more.

It allows to define formatting style related to indentation, charset,
end of lines and trailing whitespaces. It also allows to apply different
formats for different files based on wildcards, so for example it is
possible to apply different configs to *.{c,h}, *.py and *.rs.

In linux project, defining a .editorconfig might help to those people
that work on different projects with different indentation styles, so
they cannot define a global style. Now they will directly see the
correct indentation on every fresh clone of the project.

See https://editorconfig.org

Co-developed-by: Danny Lin <[email protected]>
Signed-off-by: Danny Lin <[email protected]>
Signed-off-by: Íñigo Huguet <[email protected]>
Acked-by: Mickaël Salaün <[email protected]>
Reviewed-by: Vincent Mailhol <[email protected]>
Tested-by: Vincent Mailhol <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

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