Add .gitlab-ci.yml

.gitlab-ci.yml

+build:
+    stage: build
+    script:
+        - echo "Build"
+        - mkdir build
+        - echo "gitlab ci" >/build/info.txt
+    artifacts:
+        paths:
+            - build/
+test:
+    stage: test
+    script:
+        - echo "Testing"
+        - test -f "build/info.txt"
\ No newline at end of file