Windows.IoT.Core.HWInterfaces.MPR121 1.0.0 

dotnet add package Windows.IoT.Core.HWInterfaces.MPR121 --version 1.0.0
NuGet\Install-Package Windows.IoT.Core.HWInterfaces.MPR121 -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Windows.IoT.Core.HWInterfaces.MPR121" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
paket add Windows.IoT.Core.HWInterfaces.MPR121 --version 1.0.0
#r "nuget: Windows.IoT.Core.HWInterfaces.MPR121, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
// Install Windows.IoT.Core.HWInterfaces.MPR121 as a Cake Addin
#addin nuget:?package=Windows.IoT.Core.HWInterfaces.MPR121&version=1.0.0

// Install Windows.IoT.Core.HWInterfaces.MPR121 as a Cake Tool
#tool nuget:?package=Windows.IoT.Core.HWInterfaces.MPR121&version=1.0.0

A Library to interface an MPR121 breakout board to the Raspberry Pi running Windows IoT Core

Product Compatible and additional computed target framework versions.
Universal Windows Platform uap was computed.  uap10.0 is compatible. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
1.0.0 2,255 1/17/2016

Added core MPR121 capacitive touch and release detection. See Project Url for usage samples.
Full writeup is here:
http://electronicnirvana.com/blog/capacitive-touch-with-windows-iot-core-on-raspberry-pi-2-using-mpr121

A Touch Sensitive Christmas Tree interfaced to a virtual fire place is here:
https://www.hackster.io/mohanp/touchy-christmas-tree-with-raspberry-pi-and-windows-iot-core-4eb869