add ASCII image

form http://patorjk.com/

Author: haoruilee

Diff for: README.md

@@ -4,6 +4,20 @@
 ![GitHub contributors](https://img.shields.io/github/contributors/CSWU-Challenge/CSWU-Challenge.github.io?style=for-the-badge)
 ![GitHub commit activity](https://img.shields.io/github/commit-activity/y/CSWU-Challenge/CSWU-Challenge.github.io?style=for-the-badge)
 
+```bash
+
+ ▄▄▄        ██████ ▄████▄      █     █░ ██▓ ██ ▄█▀ ██▓
+▒████▄    ▒██    ▒▒██▀ ▀█     ▓█░ █ ░█░▓██▒ ██▄█▒ ▓██▒
+▒██  ▀█▄  ░ ▓██▄  ▒▓█    ▄    ▒█░ █ ░█ ▒██▒▓███▄░ ▒██▒
+░██▄▄▄▄██   ▒   ██▒▓▓▄ ▄██▒   ░█░ █ ░█ ░██░▓██ █▄ ░██░
+ ▓█   ▓██▒▒██████▒▒ ▓███▀ ░   ░░██▒██▓ ░██░▒██▒ █▄░██░
+ ▒▒   ▓▒█░▒ ▒▓▒ ▒ ░ ░▒ ▒  ░   ░ ▓░▒ ▒  ░▓  ▒ ▒▒ ▓▒░▓  
+  ▒   ▒▒ ░░ ░▒  ░ ░ ░  ▒        ▒ ░ ░   ▒ ░░ ░▒ ▒░ ▒ ░
+  ░   ▒   ░  ░  ░ ░             ░   ░   ▒ ░░ ░░ ░  ▒ ░
+      ░  ░      ░ ░ ░             ░     ░  ░  ░    ░  
+                  ░                                   
+```
+
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