fix: Add placeholder Jenkinsfile (#16)

Signed-off-by: Cherry Wang <cherry@iotechsys.com>

Author: cherrycl

Jenkinsfile

@@ -0,0 +1,11 @@
+pipeline {
+    agent { label 'ubuntu20.04-docker-8c-8g' }
+    
+    stages {
+        stage('Placeholder') {
+            steps {
+                echo 'This is a placeholder Jenkinsfile. Define your pipeline stages as needed.'
+            }
+        }
+    }
+}