add banner

Author: haoruilee

docs/index.md

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 # 东南大学超算团队
 
+![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)
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 *"眼底龙湖水，胸中黄河月。"*
 
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 ## 页面导航
 
   本页面存储东南大学超算集群使用方法、SC竞赛入门教程、超算团队历年经验手册。