How to add a new Auth method

• create a new script in src\core\auth and create an object with AuthMethod type
• inside src\core\auth\utils.tsx:AuthMethodType add an enum value for your auth method
• then add your object to src\core\auth\index.tsx:methods
• create a button in src\screens\login\index.tsx along side the other auth buttons we have right now, call signIn with your AuthMethodType in onPress