add img to readme

Author: devflow

README.md

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+![Image](https://github.com/devflow/frost-nova/blob/master/public/icon.png)
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 # FrostNOVA
 a info helper for Arknights.kr on Windows and MacOS
 
+![Image](https://github.com/devflow/frost-nova/blob/master/gh-images/img1.jpg)
+
+![Image](https://github.com/devflow/frost-nova/blob/master/gh-images/img2.jpg)
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 ## How to use it
 1. Turn on the frostnova proxy server.
 2. On your game deivce(also can AppPlayers), setting up proxy(`default: http://127.0.0.1:8080/`) and add certification with the CA Key(`ca.pem`)