feature request: snippet style entry

[marksie1988]

Hi,

Love the plugin, not sure if this is possible but it would be great to be able to add variables that could be tabbed through, sismilar to a code snippet in VS Code.

---
title: ${1:}
categories: ${2}
tags: ${3}
---

Intro: 
${4}

Outro:
${5}

when a template is used, tabbing would take you through each of the numbered variables to enter the text, this would speed up entry and defaults could also be set with ${1:MyTitle}