Add jenkinsfile

Jenkinsfile

@@ -0,0 +1,17 @@
+node {
+  stage('Preparation') {
+    git url: 'https://github.com/fspijkerman/refinedstorage.git', branch: 'jenkins'
+  }
+  cache(maxCacheSize: 250, caches: [
+    [$class: 'ArbitraryFileCache', excludes: 'modules-2/modules-2.lock,*/plugin-resolution/**', includes: '**/*', path: '${HOME}/.gradle/caches'],
+    [$class: 'ArbitraryFileCache', excludes: '', includes: '**/*', path: '${HOME}/.gradle/wrapper']
+  ]) {
+    stage('Build') {
+       sh "./gradlew setupCIWorkspace"
+       sh "./gradlew build"
+    }
+  }
+  stage('Archive artifacts') {
+    archiveArtifacts 'build/libs/*.jar'
+  }
+}