add stories for DateTimePickerElement

stories/DateTimePickerElement.stories.tsx

@@ -0,0 +1,43 @@
+import {DateTimePickerElement, FormContainer} from '../src'
+import {ComponentMeta, ComponentStory} from '@storybook/react'
+import DateFnsProvider from '../src/DateFnsProvider'
+import {action} from '@storybook/addon-actions'
+import {SubmitButton} from '../src/Shared'
+
+export default {
+  title: 'DateTimePickerElement',
+  component: DateTimePickerElement
+} as ComponentMeta<typeof DateTimePickerElement>
+
+
+const Template: ComponentStory<typeof DateTimePickerElement> = (args) => (
+  <DateFnsProvider>
+    <FormContainer defaultValues={{}} onSuccess={action('submit')}>
+      <DateTimePickerElement {...args} />
+      <br/>
+      <SubmitButton/>
+    </FormContainer>
+  </DateFnsProvider>
+)
+
+
+export const Basic = Template.bind({})
+Basic.args = {
+  label: 'Datetime Picker',
+  name: 'basic'
+}
+
+export const RequiredPicker = Template.bind({})
+RequiredPicker.args = {
+  label: 'Datetime Picker',
+  name: 'required_picker',
+  required: true
+}
+
+export const RequiredPickerCustom = Template.bind({})
+RequiredPickerCustom.args = {
+  label: 'Datetime Picker',
+  name: 'required_picker_custom',
+  required: true,
+  validation: {required: 'Custom required message'}
+}