add jenkins file

Jenkinsfile

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+pipeline {
+    agent any
+    environment {
+        TELEGRAM_TOKEN = credentials('telegram_token')
+        TELEGRAM_CHAT_ID = credentials('telegram_chat_id')
+    }
+    tools {
+        maven 'Maven'
+    }
+    stages {
+        stage('Pre-build') {
+            steps {
+                echo 'Preparing to build...'
+                sh  'curl -s -X POST https://api.telegram.org/bot$TELEGRAM_TOKEN/sendMessage -d chat_id=$TELEGRAM_CHAT_ID -d text="Start pipline"'
+            }
+        }
+        stage('Build') {
+            steps {
+                echo 'Building...'
+                sh 'mvn -f initial/pom.xml clean install'
+            }
+        }
+        stage('Post-build'){
+            steps {
+                archiveArtifacts artifacts: '**/*.jar'
+            }
+        }
+    }
+    post {
+        success {
+            sh  'curl -s -X POST https://api.telegram.org/bot$TELEGRAM_TOKEN/sendMessage -d chat_id=$TELEGRAM_CHAT_ID -d text="Pipline success"'
+            }
+        failure {
+            sh  'curl -s -X POST https://api.telegram.org/bot$TELEGRAM_TOKEN/sendMessage -d chat_id=$TELEGRAM_CHAT_ID -d text="Pipline failed"'
+             }
+    }
+}

Lecture3/README.md

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+## Jenkins freestyle job
+1. Create a new Jenkins freestyle job named "Simple Freestyle Job".![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.47.23.png)
+2. Add my git repo in Source Code Management ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.48.30.png)
+3. Setup some environment variables for test  ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.49.02.png)
+4. Configured Build steps:
+   - Install maven plugins
+   - Add goal "clean install"  
+   - ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.49.31.png)
+5. Configure Post-build actions:
+   - Add "Archive the artifacts" and specify the path to the build artifacts `**/*.jar` to archive all .jar files 
+   - ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.49.48.png)
+
+## Jenkins pipline
+1. Create a new Jenkins pipeline job named "Simple First Pipeline".
+2. Add my git repo in Source Code Management
+3. Setup pipline defenition for all git branches and also added my test branch with Jenkins file ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.44.53.png)
+4. Create separate branch with Jenkinsfile
+5. Configure Jenkinsfile with:
+   - Add Maven tolls to build project with mvn clean install
+   - Add telegram secrets in Jenkins credentials  ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.46.10.png)
+6. Added 'Pre-build', 'Build', 'Post-build' stage
+7. Pre-build stage:
+   - Added telegram notification for start build
+8. Build stage:
+   - Added mvn clean install with path to pom.xml file
+9. Post-build stage:
+   - Added 'Archive the artifacts' and specify the path to the build artifacts `**/*.
+10. Post:
+   - Added telegram notification for build success or failure ![Alt text](Lecture3/images/Screenshot 2025-12-09 at 15.33.00.png)