add build instructions #11

I'm a long-time unix engineer, but am brand new to building for Windows, and so don't know the build tools very well. Would you be willing to add some basic build instructions to the project README?

For example, I'm currently using VS Code with the dotnet CLI tools, but am running into this bug, and don't know if this is the right approach. I see that there is also msbuild.exe as well as the full version of Visual Studio. So even having documented what you are using to build would be really helpful for me to try and replicate a known-working setup.