Added #

• Initial release of Form Shield
• Core validation framework with ValidationRule abstract class and ValidationResult class
• Validator class with support for chaining multiple validation rules
• Type-specific validator factory methods: forString(), forNumber(), forBoolean(), and forDate()
• Built-in validation rules:
  • RequiredRule - Validates that a value is not null or empty
  • EmailRule - Validates email addresses with customizable regex pattern
  • PasswordRule - Validates passwords with configurable complexity requirements
  • PasswordMatchRule - Validates that passwords match
  • LengthRule - Validates string length with min and max constraints
  • MinLengthRule - Validates minimum string length
  • MaxLengthRule - Validates maximum string length
  • ValueRule - Validates numeric values with min and max constraints
  • MinValueRule - Validates minimum numeric value
  • MaxValueRule - Validates maximum numeric value
  • PhoneRule - Validates phone numbers
  • CountryPhoneRule - Validates phone numbers for specific countries
  • CustomRule - Allows custom validation logic with fixed error message
  • DynamicCustomRule - Allows custom validation logic with dynamic error messages
• Seamless integration with Flutter's form validation system
• Example login form implementation