title: Set react-leaflet map CRS atribute
body: <p>In native Leaflet map, lib CRS attribute should be set as below</p>
  
  <pre><code>var mymap = L.map('mapid', {
      center: [-1800, 1000],
      zoom: 13,
      crs: L.CRS.Simple,
      minZoom: 0,
      maxZoom: 13,
  });
  </code></pre>
  
  <p>How to do that in react-leaflet, I had tried some things but nothing successful :/</p>
  
  <pre><code>    &lt;Map crs={CRS.useSimple()} center={[-1800, 1000]} zoom={13} doubleClickZoom={false} &gt;
  
      &lt;/Map&gt;
  </code></pre>
  
  <p>But there is an error that CRS is not imported.
  How to import CRS?</p>
  
  <p>Where do I wrong?</p>