Add map-caption to screenreader restaurant map (#143)

Author: AliyanH

screenreader/restaurants/index.html

@@ -11,6 +11,7 @@
 <!--    <mapml-viewer projection="CBMTILE" zoom="17" lat="45.4069740362364" lon="-75.70155300710053" >
       <map-layer label="CBMT" src="/experiments/refactoring-temporary/cbmtile-cbmt.mapml" checked hidden></map-layer>-->
     <mapml-viewer projection="OSMTILE" zoom="14" lat="45.406314" lon="-75.6883335" controls controlslist="geolocation">
+      <map-caption>Ottawa Restaurants Map</map-caption>
       <map-layer label="OpenStreetMap" src="../../refactoring-temporary/osm.mapml" checked hidden></map-layer>
       <map-layer id="restaurant" label="Restaurants" checked>
         <map-meta name="cs" content="gcrs" ></map-meta>