Feature/mad 91 gitlab pipeline

Gitlab pipeline definition for build, test + deploy. README updated with relevant information + description of steps for running the same jobs locally. Feel free to edit the README as you see fit.

.gitlab-ci.yml

@@ -28,4 +28,4 @@ deploy:
     tags:
         - vips-runner
     script:
-        - TWINE_PASSWORD=${CI_JOB_TOKEN} TWINE_USERNAME=gitlab-ci-token python -m twine upload --repository gitlab dist/* --verbose
+        - TWINE_PASSWORD=${CI_JOB_TOKEN} TWINE_USERNAME=gitlab-ci-token python -m twine upload --repository-url https://gitlab.nibio.no/api/v4/projects/401/packages/pypi dist/* --verbose