Add gitlab-ci file

.gitlab-ci.yml

+image: node:16
+
+build-job:
+  stage: build
+  script:
+    - npm install
+    - npm run build
+  only:
+    - merge_requests
+
+deploy-job:
+  stage: deploy
+  script:
+    - echo "This is where we will put actions to deploy app"
+  only:
+    - tags