Add a NuGet sample

[guardrex]

Per dotnet/docs#2495 (comment)

[dnfclas]

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[guardrex]

@sayedihashimi Could this one be merged (or updated+merged) quickly? ... I'd like to tie it directly into the tutorial topic.

[sayedihashimi]

Sorry for the delay. I missed the pr. I just merged it.

[neman]

There are 15 projects following certain name convention and this PR crushed that all!
For example Project names are in the form of MyProject.Con and here we have GarciaSoftware.ConsoleTemplate.CSharp !
Also template.json are following some convention until this PR

"name": "Contoso Sample #",
  "identity": "MyProject.#.Sample.CSharp",         
  "groupIdentity":"MyProject.#.Sample",
  "shortName": "sample#",

And here we got

{
  "$schema": "http://json.schemastore.org/template",
  "author": "Catalina Garcia",
  "classifications": [ "Common", "Console" ],
  "identity": "GarciaSoftware.ConsoleTemplate.CSharp",
  "name": "Garcia Software Console Application",
  "shortName": "garciaconsole"
}

Should contributors follow some rules and naming convention, or is it fine that we write whatever we like?

[guardrex]

@neman It happened inadvertently. This is a sample attached to the Custom Templates topic that was dropped in over here after that topic and the sample were created. That's why it doesn't match.

@sayedihashimi @mairaw may order some changes to both based on your issue.

[sayedihashimi]

Created #29 to track getting these updated.