Update README.md

README.md

@@ -12,3 +12,16 @@
 ## Elements:
 - proScrollToTopButton
 - proHeading
+- proModalBox
+
+
+## Additional element usage
+### proModalBox
+After adding this element you will not see it because it is hidden by default. There is parameter "Open modal element selector" which you have to use to find the element which will trigger opening the Modal Box. Selector will be used via Javascript as a "querySelectorAll".
+Basic example to make it work:
+1. Add Pro Modal Box
+2. Copy 'pro-modal-box-1' from selector parameter within "selector" parameter
+3. Add Basic Button (it could be any other button)
+4. Paste the className in the Basic Buttons parameter - "Extra class name"
+5. Click on the button and you should see the Modal Box
+You can use more buttons to open the same Modal Box.