Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Reflection;
using System.Runtime.Loader;
using Microsoft.DotNet.ProjectModel.Workspaces;

namespace ConsoleApplication
{
    public class Program
    {
        public static void Main(string[] args)
        {
        	var assemblyName = "test";
            var jsonPath = @"C:\dd";
        	var sln = new ProjectJsonWorkspace(jsonPath);
            Console.WriteLine("Hello World!");
        }
    }
}

project.json

{
    "version": "1.0.0-*",
    "buildOptions": {
        "preserveCompilationContext": true,
        "emitEntryPoint": true
    },

    "dependencies": {
        "NETStandard.Library": "1.5.0-*",
        "System.Runtime.Loader": "4.0.0-*",
        "Microsoft.DotNet.ProjectModel.Workspaces": "1.0.0-*",
        "Microsoft.CodeAnalysis": "1.3.0-beta1-20160429-01",
        "Microsoft.EntityFrameworkCore": "1.0.0-*",
        "Microsoft.NETCore.App": {
          "version": "1.0.0-*",
          "type": "platform"
        }
    },

    "frameworks": {
        "netcoreapp1.0": { 
            "imports": [ "portable-net45+win8+wp8+wpa81", "portable-net45+win8+wp8" ]
        }
    }
}