add gitlab runner config

.gitlab-ci.yml

@@ -0,0 +1,10 @@
+before_script:
+  - pipenv install -d
+flake8:
+  stage: test
+  script:
+    - pipenv run flake8
+xenon:
+  stage: test
+  script:
+    - pipenv run xenon -bB -mA -aA