- Documentation: adding dropEffectOptions in english

- Documentation: adding dropEffectOptions in english

Author: alvarotrigo

README.md

@@ -538,6 +538,8 @@ You can also prevent scrolloverflow from getting applied on responsive mode when
 
 - `dropEffect` (default `false`) [Extension of fullpage.js](http://alvarotrigo.com/fullPage/extensions/). Defines whether or not to use the drop effect on sections / slides. [Read more about how to apply the the drop effect option](https://github.com/alvarotrigo/fullPage.js/wiki/Extension-Drop-Effect).
 
+- `dropEffectOptions`: (default: `{ speed: 2300, color: '#F82F4D', zIndex: 9999}`). Allows to configure the parameters for the drop effect when using the option `dropEffect:true`.[Read more about how to apply the the drop effect option](https://github.com/alvarotrigo/fullPage.js/wiki/Extension-Drop-Effect).
+
 - `cards`: (default `false`) [Extension of fullpage.js](http://alvarotrigo.com/fullPage/extensions/). Defines whether or not to use the cards effect on sections/slides. [Read more about how to apply the cards option](https://github.com/alvarotrigo/fullPage.js/wiki/Extension-Cards).
 
 - `cardsOptions`: (default: `{ perspective: 100, fadeContent: true, fadeBackground: true}`). Allows you to configure the parameters for the cards effect when using the option `cards:true`. [Read more about how to apply the cards option](https://github.com/alvarotrigo/fullPage.js/wiki/Extension-Cards).