add react-native-sdkx

[khalisafkari]

I believe the following package should be added:

react-native-sdkx for GreedyGame is an end-to-end implementation, mediation and optimization platform for Ads

https://www.npmjs.com/package/react-native-sdkx https://github.com/khalisafkari/react-native-sdkx

admob alternative for android users to monetize