Add react/react-native dev dependencies

Author: friederbluemle

package.json

@@ -81,5 +81,9 @@
   },
   "keywords": [
     "ern-native-api-impl"
-  ]
+  ],
+  "devDependencies": {
+    "react": "16.8.3",
+    "react-native": "0.59.10"
+  }
 }