Update package.json

package.json

@@ -2,6 +2,17 @@
   "name": "3d-tiles-renderer",
   "version": "0.0.1",
   "description": "https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/specification",
+	"keywords": [
+		"3d-tiles",
+		"3dtiles",
+		"graphics",
+		"b3dm",
+		"threejs",
+		"rendering",
+		"geometry",
+		"terrain",
+		"cesium"
+	],
   "main": "src/index.js",
   "scripts": {
     "start": "parcel watch example/index.html --out-dir ./example/bundle/ --public-url . --no-cache",