docs: update testing instruction

Signed-off-by: Bo-Yi Wu <[email protected]>

Author: appleboy

README.md

@@ -3,4 +3,20 @@
 [![Run CI Lint](https://github.com/golang-queue/redisdb/actions/workflows/lint.yml/badge.svg)](https://github.com/golang-queue/redisdb/actions/workflows/lint.yml)
 [![Run Testing](https://github.com/golang-queue/redisdb/actions/workflows/testing.yml/badge.svg)](https://github.com/golang-queue/redisdb/actions/workflows/testing.yml)
 
-Redis as backend for Queue Package
+Redis as backend for [Queue package](https://github.com/golang-queue/queue)
+
+## Setup
+
+start the redis server
+
+```sh
+redis-server
+```
+
+![screen](/images/screen.png)
+
+## Testing
+
+```sh
+go test -v ./...
+```