[Rpm-maint] [rpm-software-management/rpm] Add .editorconfig, and note in CONTRIBUTING doc (PR #3219)

[Frank Dana]

@pmatilai The project was started in late 2011, like many such things it was a bit slow to gain traction — between needing plugins or integrated support to be developed for various editors, and needing to convince users it was worth bothering with.<sup>1</sup> But it's really started to pick up steam in the past few years. These days, GitHub code search reports [893,000 files matching the pattern `/\.editorconfig$/`](https://github.com/search?q=path%3A%2F%5C.editorconfig%24%2F&type=code) in its indexed public repositories. Now including rpm!

### Notes:
1. Which included having to overcome the pushback of "Why do we need this? My files have modeline comments in them." (Which is _somewhat_ valid, but modelines (a) don't help with newly-created files, unless the author makes sure to add the appropriate modeline, (b) are an impossibly cryptic solution compared to the EditorConfig INI format, and (c) aren't nearly as widely supported as `.editorconfig` is now.)

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