Update README.

Author: OlgaMaciaszek

README.adoc

@@ -88,6 +88,11 @@ https://eclipse.org[Eclipse] when working with the code. We use the
 https://eclipse.org/m2e/[m2eclipse] eclipse plugin for maven support. Other IDEs and tools
 should also work without issue as long as they use Maven 3.3.3 or better.
 
+==== Activate the Spring Maven profile
+Spring Cloud projects require the 'spring' Maven profile to be activated to resolve
+the spring milestone and snapshot repositories. Use your preferred IDE to set this
+profile to be active, or you may experience build errors.
+
 ==== Importing into eclipse with m2eclipse
 We recommend the https://eclipse.org/m2e/[m2eclipse] eclipse plugin when working with
 eclipse. If you don't already have m2eclipse installed it is available from the "eclipse