add crash reporting services for react native (#666)

docs/more-resources.md

@@ -38,4 +38,6 @@ The folks who built the app for Facebook's F8 conference also [open-sourced the
 
 [Yoga](https://yogalayout.com/) is a stand-alone layout engine that extends beyond React Native and allows product engineers to build layouts quickly for multiple platforms with a highly optimized open source layout engine designed with speed, size, and ease of use in mind.
 
+[Bugsnag](https://www.bugsnag.com/), [Microsoft App Center](https://appcenter.ms/), and [Sentry](https://sentry.io/welcome/) all provide excellent crash and error monitoring services for React and React Native apps.  These services allow you to proactively monitor crashes and issues occuring on your apps in real time so you can fix them quickly and improve user experience.
+
 The [React Developer Tools](debugging.md#react-developer-tools) are great for debugging React and React Native apps.