adding CI cmake

.gitlab-ci.yml

+image: gcc
+variables:
+  GIT_SUBMODULE_STRATEGY: normal
+  
+stages:
+  - build
+  - doc
+
+before_script:
+  - git status
+  - mkdir -p build/
+  - cd build/
+
+compile_cpp_api:
+  stage: build
+  script:
+    - cmake ..
+    - cmake --build .
+    
+pages:
+  stage: doc
+  script:
+    - cmake ..
+    - cmake --build . --target doc
+    - mv doc/html/ ../public/
+  artifacts:
+    paths:
+      - public
+  only:
+    - master
+    - cmake
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