Create UnitsNet.NuGet-README.md

For linking/importing into NuGet.org README section, until it is supported in .nuspec files.

Author: Andreas Gullberg Larsen

Docs/UnitsNet.NuGet-README.md

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+# Units.NET
+
+Everyone have written their share of trivial conversions - or less obvious ones where you need to Google that magic constant. 
+
+Stop littering your code with unnecessary calculations. Units.NET gives you all the common units of measurement and the conversions between them. It is light-weight, well-tested and portable.
+
+## Installing
+
+Run the following command in the [Package Manager Console](http://docs.nuget.org/docs/start-here/using-the-package-manager-console) or go to the [NuGet site](https://www.nuget.org/packages/UnitsNet/) for the complete relase history.
+
+`Install-Package UnitsNet`
+
+Build Targets:
+* .NET Standard 1.0
+* .NET 3.5 Client
+* [Windows Runtime Component](https://docs.microsoft.com/en-us/windows/uwp/winrt-components/) for UWP apps (JavaScript, C++ or C#)
+
+Overview
+---
+* [50+ quantities with a total of 500+ units](UnitsNet/GeneratedCode/Enums) generated from [JSON](UnitsNet/UnitDefinitions/) by [Powershell scripts](UnitsNet/Scripts/GenerateUnits.ps1)
+* [1000+ unit tests](https://ci.appveyor.com/project/anjdreas/unitsnet) on conversions and localizations
+* Quantities as immutable structs that implement `IEquatable`, `IComparable`
+* [Static typing](#static-typing) to avoid ambiguous quantities or units
+* [Operator overloads](#operator-overloads) for arithmetic on quantities
+* [Extension methods](#extension-methods) for short-hand creation and conversions
+* [Parse and ToString()](#culture) supports cultures and localization
+* [Example: Creating a unit converter app](#example-app)
+* [Precision and accuracy](#precision)
+* [Serializable with JSON.NET](#serialization)
+* Extensible with [custom units](https://github.com/anjdreas/UnitsNet/wiki/Extending-with-Custom-Units)
+* [Contribute](#contribute) if you are missing some units
+* [Continuous integration](#ci) posts status reports to pull requests and commits
+* [Who are using this?](#who-are-using)