Merge pull request #729 from microsoft/joypal/updateREADME

Update README for surface duo

Author: joyeeta26

README.md

@@ -161,6 +161,9 @@ from what's shown here):
 implementation "com.microsoft.device:dualscreen-layout:1.0.0-alpha01"
 ```
 
+NOTE: Some modules already have the SDK dependency added for providing customizations for Surface Duo.
+Please add the maven url to repositories section in your gradle script to use these modules.
+
 ### 2. Using Maven
 
 - Add the FluentUI library as a dependency: