Created Plugin docs (markdown)

Plugin-docs.md

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+## Click To Nav
+
+This plugin is included by default but disabled. In order to enable it, the option `changeOnClick` must be passed as `true`.
+
+```javascript
+const ws = new WebSlides({ changeOnClick: true });
+```
+
+This will make every click to navigate to the next slide except for clicks that happens on the following elements:
+
+* `input`.
+* `select` or `option`.
+* `button`.
+* `a`.
+* Any element with the attribute `data-prevent-nav`.