Added jenkins file

Jenkinsfile

@@ -0,0 +1,18 @@
+pipeline{ 
+    agent { label 's3'}
+    triggers {
+        pollSCM('* * * * *')
+    }
+      stages {
+         stage ('vcs') {
+            steps {
+                git branch: 'main',
+                  url: 'https://github.com/shaiksohail11/spring-petclinic.git',
+                    sh 'mvn package'
+
+
+            }
+
+         }
+      }
+}