feat(Jenkinsfile): [A] add Jenkinsfile

[A] add Jenkinsfile

Signed-off-by: Ching <loooching@gmail.com>

jenkinsfile

@@ -0,0 +1,15 @@
+pipeline {
+    agent {
+        docker {
+            image 'node:6-alpine'
+            args '-p 3000:3000'
+        }
+    }
+    stages {
+        stage('Build') {
+            steps {
+                sh 'cd frontend; npm install; npm run build'
+            }
+        }
+    }
+}