added gitlab ci

.gitlab-ci.yml

+image: latex:latest
+
+Documentation:
+  script:
+    - cd documentation
+    - pandoc --filter pandoc-citeproc --bibliography=bibliography.bib --csl=acm-sig-proceedings.csl --variable papersize=a4paper -s *.md -o documentation.pdf
+  artifacts:
+    paths:
+      - ./documentation.pdf
\ No newline at end of file