Update README.md

README.md

@@ -44,6 +44,7 @@ Browse through the most popular plugins out there today!
 |Geofencing|Monitor regions when user enters/exits.|[NuGet](https://www.nuget.org/packages/Acr.Geofencing/)|[GitHub](https://github.com/aritchie/geofences)|[@allanritchie911](https://twitter.com/allanritchie911)|
 |Geolocator|Easily detect GPS location of device.|[NuGet](https://www.nuget.org/packages/Xam.Plugin.Geolocator/)|[GitHub](https://github.com/jamesmontemagno/GeolocatorPlugin)|[@JamesMontemagno](http://www.twitter.com/jamesmontemagno)|
 |iBeacon & Estimote|Range and monitor Bluetooth beacons.|[NuGet](https://www.nuget.org/packages/Estimotes.Xplat/)|[GitHub](https://github.com/aritchie/estimotes-xplat)|[@allanritchie911](https://twitter.com/allanritchie911)|
+|In-App Billing|Make, Query, and get In-App Purchases and Subscriptions.|[NuGet](https://www.nuget.org/packages/Plugin.InAppBilling/)|[GitHub](https://github.com/jamesmontemagno/InAppBillingPlugin)|[@JamesMontemagno](http://www.twitter.com/jamesmontemagno)|
 |Lamp|Access to LED|[NuGet](https://www.nuget.org/packages/kphillpotts.Lamp.Plugin/)|[GitHub](https://github.com/kphillpotts/Xamarin.Plugins/tree/master/Lamp)|[@kphillpotts](http://www.twitter.com/kphillpotts)|
 |Local Notifications|Show local notifications|[NuGet](https://www.nuget.org/packages/Xam.Plugins.Notifier/)|[GitHub](https://github.com/edsnider/Xamarin.Plugins)|[@EdSnider](http://www.twitter.com/EdSnider), [@JamesMontemagno](http://www.twitter.com/JamesMontemagno)|
 |Manage Sleep|Manage auto sleep/auto lock.|[NuGet](https://www.nuget.org/packages/Xam.Plugins.ManageSleep/)|[GitHub](https://github.com/molinch/Xam.Plugins.ManageSleep)|[@molinch0](http://www.twitter.com/molinch0)|