Create Deno.gitignore

[fvilante]

Reasons for making this change:

I started a new project in Deno, and not found its entry here; so I'm proposing a first version Deno is not much dependent on any folder structure, this makes its .gitignore for start project very slim. TODO

Links to documentation supporting these rule changes:

Documentation Link

If this is a new template:

• Link to application or project’s homepage: Deno.Land