chore: adding .editorconfig file
chore: adding .editorconfig file

Hi my text  editor is doing stranges things when I'm editing this repo code.
What about fixing some basic rules the `jspm-cli` one (https://github.com/jspm/jspm-cli/blob/ff46dbcada4236603649344913aa543011dcfbc1/.editorconfig) ?
systemjs/plugin-babel,systemjs/plugin-babel,LivelyKernel/lively4-core,LivelyKernel/lively4-core,systemjs/plugin-babel