Update README.md

Author: EkaterinaVu

README.md

@@ -53,6 +53,10 @@ Made with [Vue.js](https://vuejs.org/)
 
 Modern browsers and IE11.
 
+## Project Documentation
+
+[Guide](https://github.com/ditdot-dev/vue-form/blob/master/GUIDE.md)
+
 ## License
 
 [MIT](https://github.com/ditdot-dev/vue-form/blob/master/LICENSE) license.