To start tinkering with Roslyn you will need the following NuGet packages:
The C# and VB compilers - Microsoft.Net.Compilers. To install it you can run the following command in the Package Manager Console:
nuget install Microsoft.Net.Compilers
The Language APIs and Services - Microsoft.Co...
The Roslyn Quoter
A tool for converting an sample C# program to syntax tree API calls. The tool itself can be found here.
Enhanced source viewer
An easy way to view the Roslyn source code can be found here.