Add reading time field to document setting panel

reading-time-document-setting-panel.js

import { registerPlugin } from "@wordpress/plugins";
import { PluginDocumentSettingPanel } from "@wordpress/edit-post";
import { TextControl } from "@wordpress/components";

import {useReadingTime} from "./reading-time-hooks.js";

registerPlugin(
  "reading-time",
  {
    render: ()=> {
      const [value, setValue] = useReadingTime();
      return <PluginDocumentSettingPanel
        title="Reading time"
      >
        <TextControl
             label="Estimated time in minutes"
                onChange={setValue}
                value={value}
            />
      </PluginDocumentSettingPanel>
    }
  }
);