readme: info about netteForms.js

Author: dg

readme.md

@@ -39,6 +39,12 @@ composer require nette/forms
 It requires PHP version 7.1 and supports PHP up to 7.4.
 
 
+Client-side support can be installed with npm or yarn:
+
+```
+npm install nette-forms
+```
+
 Usage
 -----