added pipeline

Jenkinsfile

-node {
-    stage('Clone sources') {
-        git branch: 'DRIP_3.0', url: 'https://github.com/skoulouzis/DRIP.git'
+pipeline {
+   agent any
+   tools {
+      // Install the Maven version configured as "M3" and add it to the path.
+      maven "maven-3.6.2"
+      jdk "openjdk-11"
    }
+
+   stages {
       stage('Build') {
+            steps {
                 echo 'Building'
                 git branch: 'DRIP_3.0', url: 'https://github.com/skoulouzis/DRIP.git'
                 sh "mvn -Dmaven.test.skip=true install"    
                 sh "cd drip-planner && python3 -m venv venv && venv/bin/pip3 install -r requirements.txt"   
                 sh "cd ../"
                 sh "cd sure_tosca-flask-server && python3 -m venv venv && venv/bin/pip3 install -r requirements.txt && venv/bin/pip3 install -r test-requirements.txt"   
+                sh "pwd && ls"
+        }
       }
       stage('Test') {
+          steps {
               echo 'Testing'
               sh "mvn test"
               sh "cd drip-planner && venv/bin/python3 -m unittest discover"   
               sh "cd sure_tosca-flask-server && venv/bin/python3 -m unittest discover"   
           }
+        }
         stage('Package') {
+            steps {
                 echo 'Deploying'
                 sh "cd drip-manager && mvn -Dmaven.test.skip=true install dockerfile:build"
+                
+            }
+        }             
+        stage('Deploy') {
+            steps {
+                echo 'Deploying'
+                
+            }
+        }        
    }
 }