Get additional info by typing the command: play war help
Refer to this section:
~ —include:
~ Includes given source_[file/directory]#destination_directory pairs into the WAR output path. Source can be a file or a directory while destination must be a directory!
~ Example: —include “C:\Users\stano\Documents\OneDrive\Work\Fastrope\mhg-salesforce-sync-java\.ebextensions#.ebextensions pom.xml#WEB-INF/application/pom”
For installation instructions refer to: https://github.com/playframework/play1