code for submit button added to readme

Author: cparkinson

README.md

@@ -9,13 +9,20 @@ A11y Add-on for FacetWP adds accessibility enhancements for FacetWP's form eleme
 FacetWP must be installed and activated.
 
 - Wraps all facets in a div with class=facet-wrap
-- Adds a label to each facet with text=facet_label, for=facet_name
+- Adds a label to some facets with text=facet_label, for=facet_name
+- Adds fieldset and legend to checkboxes and radio buttons
 - Adds an id to each facet with id=facet_name
 - FacetWP default checkbox markup replaced with semantic HTML checkboxes
-- Search field uses <search> landmark and real <button>
+- Search field uses <search> landmark, icon is removed
 - Always hides counts in dropdowns
 - Disables auto-refresh
 - Customizes icon for prev/next pagination links
 - Scroll back to top of results when pager is clicked
 
+## Search button
+We add the Submit button as a Custom HTML block:
+````
+<button id="search" onclick="FWP.refresh()" class="facetsubmit" type="submit">Filter</button>
+```
+
 Semantic HTML checkboxes courtesy of Mark Root-Wiley, [MRW Web Design](https://mrwweb.com/) [Accessibility Addon for FacetWP](https://github.com/mrwweb/accessibility-addon-for-facetwp)