fix: add LICENSE

feat: add `markAsPristine` to mark FormField and FormGroup as pristine (

#49)

feat: add method to check for a validator (#48)

fix: corrected maxLength validator error name (#46)

feat: add more validators

fix: cleanup dependencies (#34)

fix: ignore initial value to set dirty state

fix: set valid state to valid on validation disable

feat: add errorMessage

fix: reset initial group values on reset