Add .gitignore

[thaJeztah]

@SamWhited @AkihiroSuda PTAL

[SamWhited]

I personally don't like to gitignore .*, it just leads to a ton of exceptions over time. YMMV though and it doesn't really matter, so LGTM.

[thaJeztah]

I personally don't like to gitignore .*, it just leads to a ton of exceptions over time. YMMV though and it doesn't really matter, so LGTM.

This was after some feedback from @AkihiroSuda in another repository; basically that most hidden files are not something we need in the repository, so this would "catch" most IDE/editor/personalization files. I'm open to better suggestions though 👍

[SamWhited]

Yah, totally up to you, I probably have a pretty minority view here. I generally just think editor files need to be in system level gitignores and not in individual repos, but I do understand that people will insist on git commit -a and we'll have to weed them out in code review

[tiborvass]

I'm also not used to .* but okay.