Update README.md

Author: lele-sf

README.md

@@ -11,7 +11,7 @@ Frontend Mentor is a platform that provides real-world front-end projects for de
 Here is a list of the challenges I have completed:
 
 - [Challenge 1](https://lele-sf.github.io/frontendMentor/qr-code/): QR code component
-- ...
+- [Challenge 2](https://lele-sf.github.io/frontendMentor/results-summary/): Results summary component
 
 ## Acknowledgments