add screenshot to readme

README.md

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 # Quartz
-Host your own second brain and digital garden for free.
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+Host your second brain and [digital garden](https://jzhao.xyz/posts/digital-gardening) for free. Quartz features
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+1. Extremely fast full-text search by pressing `/`
+2. Display for backlinks of each note
+3. Fully customizable local graph view
+4. Endlessly powerful page and theme customization using CSS
+5. Automatically generated tag and section lists of content
+6. Beautiful link previews
 
 > “[One] who works with the door open gets all kinds of interruptions, but [they] also occasionally gets clues as to what the world is and what might be important.” — Richard Hamming
 
 🔗 Get Started: https://quartz.jzhao.xyz/
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+![Quartz Example Screenshot](./screenshot.png)*Quartz Example Screenshot*