added Jenkins

Signed-off-by: Pascal Syma <pascal@syma.dev>

Jenkinsfile

@@ -0,0 +1,44 @@
+pipeline {
+    agent any
+
+    tools {
+        node '15.14.0'
+    }
+
+    stages {
+        stage ('Initialize') {
+            steps {
+                echo 'Initializing..'
+            }
+        }
+        stage('Build') {
+            steps {
+                sh 'npm install'
+                sh 'npm run build'
+            }
+        }
+        stage('Archive') {
+            when {
+              branch 'master'
+              expression {
+                currentBuild.result == null || currentBuild.result == 'SUCCESS'
+              }
+            }
+            steps {
+                echo 'Archiving....'
+
+                dir("dist") {
+                    sh 'git init'
+                    sh 'git add .'
+                    sh 'git config --global user.email "jenkins@bosym.de"'
+                    sh 'git config --global user.name "Jenkins"'
+                    sh 'git commit -m "Deploy by Jenkins"'
+                    withCredentials([usernamePassword(credentialsId: 'f9aaa85c-5f26-4e5c-82fa-1c05127a6648', usernameVariable: 'username', passwordVariable: 'password')])
+                    {
+                        sh "git push --force --quiet \"https://$username:$password@git.syma.dev/Pascal/expenses.git\" master:gh-pages"
+                    }
+                }
+            }
+        }
+    }
+}