Merge branch 'jenkins' into 'master'

Add Jenkinsfile for build

See merge request !3

Jenkinsfile

+pipline {
+  agent {
+    docker {
+      image 'python:3.6-alpine'
+    }
+  }
+  stages {
+    stage('Build') {
+      steps {
+        sh 'pip -v'
+      }
+    }
+  }
+}
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