Create files for internal api

frontend/src/routes/sponsor/register/stepPersonForm.tsx

@@ -131,6 +131,15 @@ const StepPersonForm = forwardRef(
 
     useImperativeHandle(ref, () => ({ doSubmit }))
 
+    // const checkDuplicateEmail = (email: String) => {
+    //   fetch(url til api).then((res) => {
+    //     if (res.toString() === email) {
+    //       return true
+    //     }
+    //     return false
+    //   })
+    // }
+
     const validateStartDateBeforeEndDate = (startDate: Date | undefined) => {
       if (!startDate) {
         return t('validation.startDateMustBeSet')