Add demo Xcode project
Add third-party components

Add CountryPicker and RMPhoneFormat
Add phone number field and country code picker
Switch from RMPhoneFormat to libPhoneNumber-iOS
Fix third-party imports

Remove unnecessary files & add necessary frameworks
Set up country code picker with country data
Display country code picker correctly. Set up simple demo project.
Rename ESSCountryCodePicker to ESSCountryChooser (since it’s not a UIPicker)
Fix bug with countryCodeButton text not appearing