Update readme.md

Author: Sidney Andrews

readme.md

@@ -2,6 +2,7 @@
 
 - **[Download Latest Student Handbook and AllFiles Content](../../releases/latest)**
 - **Are you a MCT?** - Have a look at our [GitHub User Guide for MCTs](https://microsoftlearning.github.io/MCT-User-Guide/)
+- **Need to manually build the lab instructions?** - Instructions are available in the [MicrosoftLearning/Docker-Build](https://github.com/MicrosoftLearning/Docker-Build) repository
 
 ## What are we doing?