Add documentation for the .xcode-version
file
#424
Merged
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This document was largely copied by the now-archived fastlane.ci repository: https://github.com/fastlane/ci/blob/master/docs/xcode-version.md
I trimmed down the unnecessary parts, and updated wording here and there where I found necessary.
I believe we should still try and make this a standard in the iOS community, hence why I'm creating this PR, to give a bit more life and exposure to this great feature.