Ignore non-problematic files in the destination folder

[inadarei]

Currently Justgo requires the destination folder to be completely empty. This can be annoying if you are working in a freshly created github workspace which will typically have .git, .gitignore and README.md.

JustGo should consider presence of these three items to be equivalent of folder being empty, in order to provide better user-experience during bootstrapping.

[cmlicata]

@inadarei, I see this being problematic here since the intention is to preserve these non-problematic files.

I think the best solution would be to simply remove the README.md file from the archive and remove this line altogether?

What do you think?

[inadarei]

I assume you are saying that out of the three one (README) is a problem. In which case I agree.

One of two choices:

1. unzip somewhere else, not at the destination, do cleanup and then move - not my favorite choice
2. if you notice .git, .gitignore and README are already present:
   1. Ignore presence of .git and .gitignore
   2. In case of README - move it to some unique place (e.g. "uuid" and temp folder) do everything as it would be done normally, move it back. Probably a nice opportunity to use defer, by the way.

[cmlicata]

@inadarei, ok I will add #2 to my current implementation and submit a PR for review.