Adding index.md

Author: mamrey

plugins/osd/index.md

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+<script src="{{"/plugins/js/content-state.js" | absolute_url }}"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/openseadragon/3.0.0/openseadragon.min.js" integrity="sha512-Dq5iZeGNxm7Ql/Ix10sugr98niMRyuObKlIzKN1SzUysEXBxti479CTsCiTV00gFlDeDO3zhBsyCOO+v6QVwJw==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+
+## OpenSeadragon
+
+This is a demo of the [OpenSeadragon](https://openseadragon.github.io/) viewer. This viewer works with IIIF Image API images and is included in many of the more advanced viewers like Mirador and the UV.
+
+Use your mouse wheel to zoom in or use the + or - minus buttons
+
+
+<div id="osd" style="width: 100%; height: 586px"></div>
+
+<script type="text/javascript">
+    var infoJson = getContentState();
+    OpenSeadragon({
+            id:                 "osd",
+            prefixUrl:          "https://cdnjs.cloudflare.com/ajax/libs/openseadragon/3.0.0/images/",
+            preserveViewport:   true,
+            visibilityRatio:    1,
+            sequenceMode:       true,
+            tileSources:   [infoJson]
+        });
+</script>