Added Jenkins

Jenkinsfile

@@ -0,0 +1,26 @@
+pipeline {
+    agent any
+
+    environment {
+        JAVA_HOME = '/usr/lib/jvm/java-21-openjdk-amd64'
+        ANDROID_HOME = '/opt/android-sdk'
+        ANDROID_SDK_ROOT = '/opt/android-sdk'
+        PATH = "/usr/lib/jvm/java-21-openjdk-amd64/bin:/opt/android-sdk/cmdline-tools/latest/bin:/opt/android-sdk/platform-tools:${env.PATH}"
+    }
+
+    stages {
+        stage('Build Android APK') {
+            steps {
+                cleanWs()
+                checkout scm
+
+                sh '''
+                    chmod +x ./gradlew
+                    ./gradlew clean assembleDebug
+                '''
+
+                archiveArtifacts artifacts: '**/build/outputs/apk/**/*.apk', fingerprint: true
+            }
+        }
+    }
+}