React-native-windows: Support react-native-config

[qmatteoq]

Support react-native-config on RNW

Basic Info

• Module Repo URL: https://github.com/luggit/react-native-config
• Target version: 0.61
• [ ] Issue exists on module repo (if so, link)
• [ ] Module has a Legacy/C# implementation (if so, link)

Which app/customer is requesting this module?

An AppConsult customer

In what scenarios will this module be used?

This module allows to expose config variables to your javascript code in React Native through a .env file. The customer is using this module to keep all the default settings of the app in a dedicated configuration file.

Essential Features

Read a setting from the .env file

[chrisglein]

@jonthysell What's the status on react-native-config? Did you get it working?

[asklar]

@chrisglein this is different - this is react-native-config which is a native module for handling app configuration. @jonthysell 's thing was the react-native config command to get config data about build-time preferences for a project

[stmoy]

Dupe of #4149