Add .gitlab-ci.yml

.gitlab-ci.yml

+# These are the default stages.
+# You don't need to explicitly define them.
+# But you could define any stages you want.
+stages:
+  - build
+  - test
+  - deploy
+
+# This is the name of the job.
+# You can choose it freely.
+maven_build:
+  # A job is always executed within a stage.
+  # If no stage is set, it defaults to 'test'.
+  stage: test
+  # Since we require Maven for this job,
+  # we can restrict the job to runners with a certain tag.
+  # Of course, it is our duty to actually configure a runner
+  # with the tag 'maven' and a working maven installation
+  tags:
+    - maven
+  # Here you can execute arbitrate terminal commands.
+  # If any of the commands returns a non zero exit code the job fails.
+  script:
+    - echo "Building project with maven"
+    - mvn verify
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