Add react-native-config

Author: tomu28

.babelrc

@@ -1,8 +1,10 @@
 {
-  "presets": ["babel-preset-expo"],
+  "presets": ["babel-preset-expo",
+              "module:metro-react-native-babel-preset",
+              "module:react-native-dotenv"],
   "env": {
     "development": {
-      "plugins": []
+      "plugins": ["@babel/plugin-transform-react-jsx-source"]
     }
   }
 }