* xcconfig Support
* Added supporting an xcconfig file so that multiple users can build/work with the project without needing to change signing info
* Added a template xcconfig file to be shared in repo (your xcconfig file is never committed to Git repo)
* Updated README
* Ignore xcconfig File
* Add the users xcconfig file to .gitignore
* Update README.md
* Update README.md as per review suggestions
* Add release config
Co-authored-by: Thomas Ricouard <ricouard77@gmail.com>
