Add doc as to how to create a blog article.

[rushiagr]

There might be a better way to do it, just that I don't know of any. Please feel free to suggest edits to this patch.

[jorinvo]

hi @rushiagr! There is a simpler way to create a new post with hugo. hugo new blog/your-new-post.md By specifying the directory it also automatically adjusts the meta data according to the defined archetype.