Create Dotnet CLI compatible templates

[thecodejunkie]

We need to replace the old VSIX templates with templates that work with the dotnet new command. This blogpost details the basics for creating the templates based on the new templating engine

Todo

• Update readme.md with instructions on how to use the new templates
• Copy https://github.com/NancyFx/Nancy/blob/master/.editorconfig to this repository
• Copy https://github.com/NancyFx/Nancy/blob/master/.gitattributes to this repository
• Setup NuGet publishing

Templates to create (need to be decided what we should support out of the box)

• Placeholder

template.json (need to fill this out and use as our own template)

{
   "author": "NancyFx and community",
   "classifications": [ "" ],
   "defaultName": "",
   "identity": "", 
   "name": "",
   "preferNameDirectory" : "true",
   "shortName": "",
   "sourceName": "",
   "tags": {
       "language": "C#"
   }
}