add source analyze doc (sofastack#242)

README.md

@@ -39,6 +39,7 @@ SOFARegistry 是蚂蚁金服开源的一个生产级、高时效、高可用的
    - [发布订阅推送](https://www.sofastack.tech/projects/sofa-registry/code-analyze/code-analyze-publish-subscription-push/)
    - [registry meta 选主](https://www.sofastack.tech/projects/sofa-registry/code-analyze/code-analyze-registry-meta/)
    - [数据表监听](https://www.sofastack.tech/projects/sofa-registry/code-analyze/code-analyza-data-table-listening/)
+   - [推送开关](https://www.sofastack.tech/projects/sofa-registry/code-analyze/code-analyze-push-switch/)
 
 
 ## 贡献