Add interactive points demo to the readme

.npmignore

@@ -6,3 +6,5 @@ gobblefile.js
 aux
 .gobble
 .gobble-build
+yarn.lock
+demo

README.md

@@ -20,6 +20,8 @@ With sliced TopoJSON: http://leaflet.github.io/Leaflet.VectorGrid/dist/demo/demo
 
 With protobuf `VectorTile`s: http://leaflet.github.io/Leaflet.VectorGrid/dist/demo/demo-vectortiles.html
 
+With clickable points and lines (from protobuf tiles): http://leaflet.github.io/Leaflet.VectorGrid/dist/demo/demo-points.html
+
 
 ## Using
 

demo/demo-points.html

@@ -70,7 +70,7 @@
 				road_label: [],
 				housenum_label: [],
 			},
-			interactive: true,
+			interactive: true,	// Make sure that this VectorGrid fires mouse/pointer events
 			getFeatureId: function(f) {
 				return f.properties.osm_id;
 			}
@@ -86,7 +86,7 @@
 			highlight = null;
 		};
 		var pbfLayer = L.vectorGrid.protobuf(url, vectorTileOptions)
-			.on('click', function(e) {
+			.on('click', function(e) {	// The .on method attaches an event handler
 				L.popup()
 					.setContent(e.layer.properties.name || e.layer.properties.type)
 					.setLatLng(e.latlng)
@@ -113,4 +113,4 @@
 		map.setView([40.9994639, -74.163208], 15);
 	</script>
 </body>
-</html>
+</html>