Add Sign in with Apple Setup

[PSchmiedmayer]

Add Sign in with Apple Setup

:gear: Release Notes

• Adds a basic setup for the test project with the Sign in with Apple entitlement and enables this in the app identifier.

:pencil: Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• [x] I agree to follow the Code of Conduct and Contributing Guidelines.

[PSchmiedmayer]

Closed by just merging it right in the #28 branch.