Revert "Remove xcode file from the project"

This reverts commit d0007775959d355e7b16a2683cb5b214b34caf42.
Revert "remove more Diego-specific xcode files that don't belong in a common library"

This reverts commit e9b2c7734554b0b71ccd95885bf0b3eac006f86e.
Remove xcuserdata directories
Ignore xcuserdata directories