editorconfig from Lucene

[dsmiley]

https://github.com/apache/lucene/pull/14740

Complementary with Spotless/tidy. "Shift Left"

I'd rather commit this as-is and then later improve it for considerations of our project (e.g. Kotlin). I'm not signing up to improve it right now; I just want to get some progress here. New users have stumbled on formatting and this will help.