[Feature Request] Support for decorators like highlight & underline

[bilalshams7]

I would like to add highlight/underline and ability to add notes feature . From my understanding in readium architecture a text object in Locator helps us to access text in the publication. But I’m not getting the text object in react native readium. Could you please provide information on how to access the text object using React Native Readium?

If my explanation isn't clear, the text object I'm referring is : https://readium.org/architecture/models/locators/#the-text-object

[jspizziri]

@bilalshams7 this is not a currently supported. Would love a PR for it though!