Updated jenkinsfile to the newest version

Jenkinsfile

@@ -1,20 +1,3 @@
 node {
-   stage('Preparation') { // for display purposes
-      // Get some code from a GitHub repository
-      git credentialsId: '520d2a48-92fa-484d-92db-962576ad1ce7', url: '[email protected]:praqma-training/gildedrose.git'
-      // Get the Maven tool.
-      // ** NOTE: This 'M3' Maven tool must be configured
-      // **       in the global configuration.           
-
-   }
-   stage('Build') {
-      // Run the maven build
-      if (isUnix()) {
-         sh "mvn -Dmaven.test.failure.ignore clean package"
-      }
-   }
-   stage('Results') {
-      junit '**/target/surefire-reports/TEST-*.xml'
-      archive 'target/*.jar'
-   }
+   echo 'Hello World'
 }