ci(gitlab): provide basic test and build stages

.gitlab-ci.yml

+include:
+  - template: Code-Quality.gitlab-ci.yml
+
+
+stages:
+  - test
+  - build
+  - release
+
+tests:
+  stage: test
+  image: node:10
+  before_script:
+    - npm install
+  script:
+    - npx markdownlint -o markdownlint-report.txt rdd-technical-reference.md
+  artifacts:
+    expose_as: 'markdownlint report'
+    paths:
+      - markdownlint-report.txt
+  except:
+    - tags
+
+create_pdf:
+  stage: build
+  image: pandoc/latex
+  before_script:
+    - pandoc --version
+  script:
+    - pandoc --template=rdd.latex rdd-technical-reference.md -o rdd-technical-reference.pdf
+  only:
+    - master