Merge branch 'development' into 'master'

Add jenkinsfile

See merge request Math512/social-aggregator!2

jenkinsfile

@@ -0,0 +1,13 @@
+pipeline {
+    agent { docker { image 'cangol/android-gradle:latest' } }
+    stages {
+        stage('build') {
+            steps {
+                sh 'gradle --version'
+            }
+        }
+        stage('test') {
+        sh 'echo Hello World'
+        }
+    }
+}