Update README.md with additional library

Author: stephentoub

README.md

@@ -64,6 +64,7 @@ More libraries are coming soon (the overall list of items we currently plan to m
 |<sub>**System.ComponentModel.Primitives**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.ComponentModel.Primitives.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides interfaces that are used to implement the run-time and design-time behavior of components.</sub>|
 |<sub>**System.ComponentModel.TypeConverter**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.ComponentModel.TypeConverter.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides the System.ComponentModel.TypeConverter class, which represents a unified way of converting types of values to other types.</sub>|
 |<sub>**System.Console**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Console.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides the Console class, which enables access to the standard input, output, and error streams for console-based applications.</sub>|
+|<sub>**System.Data.Common**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Data.Common.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides the base abstract classes, including System.Data.DbConnection and System.Data.DbCommand, for data providers.</sub>|
 |<sub>**System.Diagnostics.Contracts**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Diagnostics.Contracts.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides types and methods for representing program contracts such as preconditions, postconditions, and invariants.</sub>|
 |<sub>**System.Diagnostics.Debug**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Diagnostics.Debug.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides a class to interact with the debugger as well as methods for performing runtime assertions.</sub>|
 |<sub>**System.Diagnostics.FileVersionInfo**<br/>[![MyGet Package](https://img.shields.io/myget/dotnet-core/v/System.Diagnostics.FileVersionInfo.svg)](https://www.myget.org/gallery/dotnet-core)</sub>|<sub>Provides useful functionality for querying and examining the version information of physical files on disk.</sub>|