Requested Feature: (short description)

When creating a new post with `nikola new_post, either mark it as draft, or allow do be marked as draft.

Do you want to contribute this yourself as a pull request? (don’t worry about it if you don’t want to/can’t — someone else can take care of it)

• Yes, I have already written code for it (link if available and feasible)
• Yes, I don’t have code ready yet (that’s okay!)
• No (that’s okay too!)

Does this feature affect backwards compatibility? If yes, in what way?

Only if it's the default.

Rationale and full description: (why should it be added to Nikola?)

I always have several things I want to write about running around in my head and as post files. Many are left in this state because I don't always get a combination of free time, energy and focus on a given subject.

But by default Nikola sets posts as public, and I end up publishing unfinished drafts, like in https://www.grulic.org.ar/~mdione/glob/posts/replacing-an-orm-with-sqlite-and-dataclasses/

So my workflow is, create the new post, write on top of the .md file whatever I had already written in my editor, and then opening the .meta file to add line saying it's a draft. Which I not always remember to do )see above).

The addition would either set the post as draft by default; and/or would add an option to new_post to mark it as draft/final.

I am willing to code the thing myself, just don't ho9ld your breath on it.