Add .gitlab-ci.yml

.gitlab-ci.yml

+# This file is a template, and might need editing before it works on your project.
+# Official framework image. Look for the different tagged releases at:
+# https://hub.docker.com/r/library/node/tags/
+image: node:latest
+
+# This folder is cached between builds
+# http://docs.gitlab.com/ce/ci/yaml/README.html#cache
+cache:
+  paths:
+  - node_modules/
+
+build:
+  script:
+   - npm install
+   - gulp build