Update README.md

Author: huhuhang

README.md

@@ -69,6 +69,7 @@ Java is a versatile, object-oriented programming language. This Skill Tree provi
 - [CSS Programming Projects](https://github.com/labex-labs/practice-css-programming-projects)
 - [JavaScript Programming Projects](https://github.com/labex-labs/practice-javascript-programming-projects)
 - [React Programming Projects](https://github.com/labex-labs/practice-react-programming-projects)
+- [MongoDB Programming Projects](https://github.com/labex-labs/practice-mongodb-programming-projects)
 
 
 ## Other Lists