Add example run package.json script

package.json

@@ -16,7 +16,8 @@
     "test": "jest",
     "test:watch": "jest --watch",
     "lint": "eslint src --ext .ts",
-    "download-protos": "ts-node -O '{\"module\": \"CommonJS\"}' scripts/download-protos.ts"
+    "download-protos": "ts-node -O '{\"module\": \"CommonJS\"}' scripts/download-protos.ts",
+    "example": "ts-node -O '{\"module\": \"CommonJS\"}'"
   },
   "prettier": {
     "printWidth": 80,