Add ink-form to useful components (#419)

Author: lukasbach

readme.md

@@ -1748,6 +1748,7 @@ You can even inspect and change the props of components, and see the results imm
 - [ink-quicksearch-input](https://github.com/Eximchain/ink-quicksearch-input) - Select component with fast quicksearch-like navigation.
 - [ink-confirm-input](https://github.com/kevva/ink-confirm-input) - Yes/No confirmation input.
 - [ink-syntax-highlight](https://github.com/vsashyn/ink-syntax-highlight) - Code syntax highlighting.
+- [ink-form](https://github.com/lukasbach/ink-form) - Form component.
 
 ## Useful Hooks