Add Roslyn/C# toolchain to srclib

srclib ([login to view URL]) is a polyglot static analysis tool that generates data for editors and code browsers to use. We want it to support C#. Create a C# toolchain for srclib, and publish it on GitHub under the MIT license. Guide: [login to view URL] Browse for example toolchains: [login to view URL] Like [login to view URL] C# and VB.NET have a parsing API you can connect to provide the data structures: [login to view URL] Add unit and integration tests for everything, and use travis badges to show that your tests are passing with each commit.