maven java build example with one override

Author: jonenst

README.md

@@ -11,3 +11,13 @@ Update all
 # --rebase or --merge as you wish
 $ git submodule update --remote --recursive --rebase --jobs 8
 ```
+
+Quick backend maven compile with changes in a few libs (example):
+```
+$ mvn compile -DskipTests -pl servers/study-server/ -am -Dpowsybl-ws-commons.version=1.6.0-SNAPSHOT
+[INFO] ------------------------------------------------------------------------
+[INFO] Reactor Build Order:
+[INFO]
+[INFO] powsybl ws commons                                                 [jar]
+[INFO] Study Server                                                       [jar]
+```