Update README.md

Author: collabnix

intermediate/README.md

@@ -9,7 +9,7 @@ description: collabnix | DockerLab | Docker - Intermediate Track
 
 ## Docker for Developers
 
-[Multi-Stage Build]()<br>
+[Multi-Stage Build](./docker-multistage-build/multiStageBuild.md)<br>
 
 ## Docker Desktop for Windows