Add xcode project

[nmoinvaz]

This issue is for adding an xcode project to the source code for people on Apple devices.

[Coeur]

Oh, I have one on the "Example" branch of my fork. I'll pull request it later.

[nmoinvaz]

I am thinking of having three separate projects. One for a minizip.lib, one for miniunz.exe, and one for minizip.exe. And doing the same for xcode.

[Coeur]

OK. You can assign the Xcode versions to me. What would be the folder name to put it? darwin, xcode, apple?

[MacGritsch]

You can have 3 targets in one Xcode project.

Does it make sense to place the source files in 3 corresponding folders?

[nmoinvaz]

I would recommend a folder called xcode.

[nmoinvaz]

Thank you! I have made some minor changes to the target names.