doc: add stargazers

Author: changsongl

README.md

@@ -192,7 +192,10 @@ I will work on this project all the time! I will add more features and
 3. Fork the project, and checkout your branch from "develop" branch.
 4. Submit the PR to "develop" branch.
 5. It will be merged after code review.
- 
+
+### Stargazers
+[![Stargazers over time](https://starchart.cc/changsongl/delay-queue.svg)](https://starchart.cc/changsongl/delay-queue)
+
 ### Reference
 
 Youzan Design Concept [Youzan Link](https://tech.youzan.com/queuing_delay/)

README_ZH.md

@@ -172,7 +172,10 @@ delay_queue_in_flight_jobs_numbers_in_queue{queue="dq_queue_mytopic"} 1
 3. Fork项目进行开发，并以develop分支，创建自己的分支进行开发。如fix-xxx, feature-xxx等等。
 4. 开发完成后，发起PR合入develop。
 5. Code Review后将会把你的代码合进分支。
- 
+
+### Stargazers
+[![Stargazers over time](https://starchart.cc/changsongl/delay-queue.svg)](https://starchart.cc/changsongl/delay-queue) 
+
 ### Reference
 
 Youzan Design Concept [Youzan Link](https://tech.youzan.com/queuing_delay/)