Update 'README.md'

edit readme

README.md

@@ -1,9 +1,17 @@
 # Pipeline gCubeBuild
 
-Given a git repository and a valid branch, a maven build is performed.
+Given a git repository and a valid branch, a maven build is performed using jdk8.
 For the moment a predefined goal is set inside the pipeline: "clean deploy"
 
 
 ## USAGE TIPS:
 
-It can be added to a jenkinsjob or invoked manually
+It can be added to a jenkinsjob or invoked manually
+
+#Expected parameters
+
+GIT_URL url of the project to build; 
+GIT_BRANCH branch of the project to build.
+
+In this first version the jdk used is jdk8. In the future we can specify the jdk as input parameter. 
+