Add Jenkinsfile

The Jenkinsfile performs packaging and testing on the project. When on
the develop branch, a SonarQube analysis is conducted.

Jenkinsfile

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+pipeline {
+	agent any
+
+	options {
+		ansiColor('xterm')
+	}
+
+	stages {
+		stage('Build') {
+			steps {
+				sh 'mvn -DskipTests clean package'
+			}
+		}
+		stage('Test') {
+			steps {
+				sh 'mvn test'
+			}
+			post {
+				always {
+					junit '*/target/surefire-reports/*.xml'
+					publishCoverage adapters: [jacocoAdapter(mergeToOneReport: true, path: '*/target/site/jacoco/jacoco.xml')]
+				}
+			}
+		}
+		stage('SonarQube Analysis') {
+			when {
+				branch 'develop'
+			}
+			steps {
+				withSonarQubeEnv('KSKE SonarQube') {
+					sh "$SONAR_MAVEN_GOAL"
+				}
+			}
+		}
+	}
+	post {
+		success {
+			archiveArtifacts artifacts: '*/target/event-bus-*.jar'
+		}
+	}
+}