Update README.md

README.md

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-# media_thumbnails_jp2
+# media_thumbnails_jp2
+This module uses the [Media Thumbnails](https://www.drupal.org/project/media_thumbnails) framework to create media entity thumbnails for jp2 files.
+
+That way you can add the media entity 'thumbnail' field to Views or Media entity display modes, optionally add an image style and get preview images for jp2 files.
+
+Requirements
+* drupal/media_thumbnails
+* ImageMagick php extension (imagemagick would need to be installed with jp2 support. Please see here for additional info.)