Info.plist is needed for the Mac

[bltzr]

it is added in every example from the submodules, but apparently not systematicall, e.g. from addons examples
maybe it should be stored at some place in the repo, and added to the build mechanism
considering its name (and from the main cmake file), it can be name openFrameworksInfo.plist or just Info.plist for XCode building, while ninja only accepts Info.plist

in the cannonical version of of, it lays there: https://github.com/openframeworks/openFrameworks/blob/master/scripts/templates/osx/openFrameworks-Info.plist