Add .gitlab-ci.yml

.gitlab-ci.yml

+test-centos7:
+  image: centos:centos7
+  stage: test
+  script:
+  - yum install -y epel-release
+  - yum install install -y python35-pip python35-devel
+  - cd ippisite
+  - pip3 install -r requirements.txt
+  - python3 manage.py test
\ No newline at end of file