added cicd configuration

.gitlab-ci.yml

+pages-devel:    
+  stage: deploy
+  script:
+    - npm install
+    - "pm2 delete --silent project || :"
+    - pm2 start ./app.js --name=project
+    - pm2 save
+  tags: 
+    - testing
+  only: 
+    - testing
+    
+pages-devel:    
+  stage: deploy
+  script:
+    - npm install
+    - "pm2 delete --silent project || :"
+    - pm2 start ./app.js --name=project
+    - pm2 save
+  tags: 
+    - production
+  only: 
+    - master
+