Example for SO 33845962

Models_Entry.cs

namespace Simple.Models
{
    public class Entry
    {
        public int EntryID { get; set; }
        public string SomeString { get; set; }
    }

}

Models_SimpleContext.cs

namespace Simple.Models
{
    public class Entry
    {
        public int EntryID { get; set; }
        public string SomeString { get; set; }
    }

}

project.json

{
  "version": "1.0.0-*",
  "tooling": {
    "defaultNamespace": "Simple"
  },

  "dependencies": {
    "EntityFramework.Commands": "7.0.0-rc1-final",
    "EntityFramework.Sqlite": "7.0.0-rc1-final"
  },

  "commands": {
    "ef": "EntityFramework.Commands"
  },

  "frameworks": {
    "dnx451": { },
    "dnxcore50": { }
  }
}

Startup.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.PlatformAbstractions;

using Microsoft.Data.Entity;

namespace Simple
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
          services.AddEntityFramework()
                .AddSqlite()
                .AddDbContext<Models.SimpleContext>(options =>
                {
                    var appEnv = CallContextServiceLocator.Locator.ServiceProvider
                              .GetRequiredService<IApplicationEnvironment>();
                    options.UseSqlite($"Data Source={ appEnv.ApplicationBasePath }/sample.sqlite");
                });
        }
    }
}