[Enhancement]: Preview The Markdown Text  #298

Describe the bug

Not a bug,just a feature

Firstly, thx for author provide such a good app. I am used to taking notes with markdown, but masscode can only display the original content, I hope it can help me preview the text and become more beautiful, eg github typora

It's posiable?

To reproduce

...

Version

Version: 2.10.0 Electron: 16.2.3 Chrome: 96.0.4664.174 Node.js: 16.9.1

OS

macos

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