docs: add README

README.md

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+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="assets/banner.dark.svg">
+  <img alt="Banner" src="assets/banner.light.svg">
+</picture>
+
+# GZ::CTF Documentation
+
+[![Telegram Group](https://img.shields.io/endpoint?color=blue&url=https%3A%2F%2Ftg.sumanjay.workers.dev%2Fgzctf)](https://telegram.dog/gzctf)
+[![QQ Group](https://img.shields.io/badge/QQ%20Group-903244818-blue)](https://jq.qq.com/?_wv=1027&k=muSqhF9x)
+[![Discord](https://img.shields.io/discord/1239476909033656320?label=Discord)](https://discord.gg/dV9A6ZjVhC)
+
+GZ::CTF is an open source CTF platform based on ASP.NET Core.
+
+- Website: [https://ctf.gzti.me](https://ctf.gzti.me)
+- Repository: [https://github.com/GZTimeWalker/GZCTF](https://github.com/GZTimeWalker/GZCTF)