added Jenkins file

Jenkinsfile

@@ -0,0 +1,32 @@
+pipeline {
+    agent any
+    tools {
+        jdk "jdk-21" // valid options are: "jdk-8", "jdk-16", "jdk-17" or "jdk-21", choose which one you need
+    }
+    stages {
+        stage('Clean') {
+            steps {
+                echo 'Cleaning Project'
+                sh 'chmod +x gradlew'
+                sh './gradlew clean'
+            }
+        }
+        stage('Build & Publish') {
+            steps {
+                echo 'Building & Publishing'
+                sh './gradlew build publish'
+            }
+        }
+    }
+    post {
+        always {
+            discordSend(
+                webhookURL: "https://discord.com/api/webhooks/1313642177083216073/H8EnQ65JusCjpqGTqLXDZI1BYBe4ArLJn3xSjEOWthg4Nwa7ZFSHu1SYag8fU4v4DB8k"
+                title: "GTCore ${TAG_NAME} #${BUILD_NUMBER}"
+                link: env.BUILD_URL
+                result: currentBuild.currentResult
+                description: "Build: [${BUILD_NUMBER}](${env.BUILD_URL})\nStatus: ${currentBuild.currentResult}"
+            )
+        }
+    }
+}