add vscodeMarkdownNotes.newNoteDirectory

add setting vscodeMarkdownNotes.newNoteDirectory

Enhancements:

• add setting vscodeMarkdownNotes.newNoteDirectory, can be set to:
  • SAME_AS_ACTIVE_NOTE
  • WORKSPACE_ROOT
  • or subdirectory/path in workspace root
• resolves #74

An example workspace config you might want to use to manage _posts on a jekyll blog:

{
  "vscodeMarkdownNotes.newNoteDirectory": "_posts",
  "vscodeMarkdownNotes.newNoteTemplate": "---\nlayout: post\ntitle: '${noteName}'\nauthor: kortina\n---\n\n"
}

Diff:

https://github.com/kortina/vscode-markdown-notes/compare/808af92c40676ab2a9ae1d1de3611a930c6c5818..fa011bb64c363a05231a043f39f800e7497617a9