Create a simple Jenkinsfile

This is just something basic to start with for our Patron generation

Jenkinsfile

@@ -0,0 +1,12 @@
+#!/usr/bin/env groovy
+
+node {
+    stage "Checkout"
+    checkout scm
+  
+    stage 'Build HTML'
+    withEnv(["JAVA_HOME=${tool 'jdk8'}",
+                "PATH+GROOVY=${tool 'groovy'}/bin"]) {
+        sh 'groovy ./build.groovy'
+    }
+}