Update sprint README

HexRabbit · HexRabbit · commit 8ec17ed7793c · 2020-08-26T16:15:15.000+08:00
diff --git a/2020/Google-CTF/sprint/README.md b/2020/Google-CTF/sprint/README.md
@@ -0,0 +1,3 @@
+## SPRINT writeup
+
+[Blog writeup](https://blog.hexrabbit.io/2020/08/25/Google-CTF-2020-sprint-Writeup) (in Chinese)

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+## SPRINT writeup`
	`2`	`+`
	`3`	`+[Blog writeup](https://blog.hexrabbit.io/2020/08/25/Google-CTF-2020-sprint-Writeup) (in Chinese)`