add screenshot to readme

README.md

@@ -1,6 +1,16 @@
 # Quartz
-Host your own second brain and digital garden for free.
+
+Host your second brain and [digital garden](https://jzhao.xyz/posts/digital-gardening) for free. Quartz features
+
+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/
+🔗 Get Started: https://quartz.jzhao.xyz/
+
+![Quartz Example Screenshot](./screenshot.png)*Quartz Example Screenshot*