增加教程地址

README.md

@@ -582,6 +582,7 @@ React 例子:[demo-react.md](/教程/demo-react.md) <br>
 17. [HQChart实战教程74-自定义指标标题栏](https://jones2000.blog.csdn.net/article/details/140488167)  
 18. [HQChart实战教程75-分时图回放](https://blog.csdn.net/jones2000/article/details/140682155)   
 19. [HQChart实战教程76-自定义Y轴刻度线](https://jones2000.blog.csdn.net/article/details/140949881)    
+20. [HQChart实战教程77-手动创建线段类画图工具](https://jones2000.blog.csdn.net/article/details/142188981)   
 
 ## HQChart报价列表高级应用教程(付费文章)
 1. [HQChart报价列表高级应用教程1-雪球数据对接报价列表](https://blog.csdn.net/jones2000/article/details/124759574)