feat(form): add Slider demo (#555)

木头锤纸

2021-04-28 e80280fb81b0bcdd74066c08fd4403e36b00b026

 src/components/Form/src/types/index.ts

@@ -108,4 +108,5 @@
  | 'StrengthMeter'
  | 'Upload'
  | 'IconPicker'
  | 'Render';
  | 'Render'
  | 'Slider';