Create React Native wrapper for ios/android network test

[jonathanwmaddison]

Feature request: It would be very convenient to create an implementation of this for ios/android in React Native. It would tie in nicely with the new opentok React Native repo. Is anyone planning on this?

[enricop89]

@jonathanwmaddison I added some sample code for the Network Test. You can check it out here: https://github.com/nexmo-saleseng/opentok-react-native-samples/tree/feature.network-test-sample/OTNetworkTest