docs: add docs

Author: zcong1993

README.md

@@ -1,9 +1,19 @@
-# leetcode-tool
+# leetcode-tool ![goreleaser](https://github.com/zcong1993/leetcode-tool/workflows/goreleaser/badge.svg)
 <!--
 [![Go Report Card](https://goreportcard.com/badge/github.com/zcong1993/leetcode-tool)](https://goreportcard.com/report/github.com/zcong1993/leetcode-tool)
 -->
 
-> my go grpc project
+> 一个让你更方便刷题的工具
+
+## Install
+
+```bash
+$ brew tap zcong1993/homebrew-tap
+$ brew install zcong1993/homebrew-tap/leetcode-tool
+
+# show help
+$ leetcode-tool help
+```
 
 ## License