title: How to add existing .Net core code to a new solution
body: <p>I'm trying to reorganize my code and project structure to be microservice-like.
  I created a new .sln file, and would like to add an existing .NET core 1.0 folder (that is a class library for an AWS Lambda function) to it.  I don't understand why there isn't a .csproj file to add in the core project.  Thus, how do I add it to the solution? </p>