diff --git a/jenkinsfile b/jenkinsfile
index 8b2c8ca..9c499f0 100644
--- a/jenkinsfile
+++ b/jenkinsfile
@@ -1,11 +1,19 @@
 pipeline {
-    agent any
-
-    stages {
-        stage('Hello') {
-            steps {
-                echo 'Hello World'
-            }
-        }
+   agent any
+   stages {
+    stage('Checkout') {
+      steps {
+        script {
+           // The below will clone your repo and will be checked out to master branch by default.
+           git credentialsId: 'jenkins-user-github', url: 'https://git.wmi.amu.edu.pl/s478831/ium_478831.git'
+           // Do a ls -lart to view all the files are cloned. It will be clonned. This is just for you to be sure about it.
+           sh "ls -lart ./*" 
+           // List all branches in your repo. 
+           sh "git branch -a"
+           // Checkout to a specific branch in your repo.
+           sh "git checkout master"
+          }
+       }
     }
+  }
 }