Added Jenkinsfile.

Jenkinsfile

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+pipeline {
+    agent {
+        docker {
+            image 'node:19-bullseye-slim' 
+            args '-p 3000:3000' 
+        }
+    }
+	environment {
+        CI = 'true'
+		NODE_ENV = 'production'
+    }
+    stages {
+        stage('Build') { 
+            steps {
+                sh 'npm install'
+				sh 'npm install react-scripts@3.4.1 -g'
+				sh 'npm clean-install --only=production'
+            }
+        }
+    }
+}
+