EditorConfig is awesome (http://editorconfig.org)

.editorconfig

# EditorConfig is awesome: http://EditorConfig.org

root = true

[*]
charset = utf-8
end_of_line = lf
indent_style = space
indent_size = 2
insert_final_newline = true
trim_trailing_whitespace = true

[*.{js,json,yaml,yml}]
indent_size = 2

[*.md]
trim_trailing_whitespace = false