added GitlabCI config file

.gitlab-ci.yml

@@ -0,0 +1,10 @@
+image: alpine:latest
+
+stages:
+  - build
+
+build:
+  stage: build
+  script:
+    - gcc --version
+    - mkdir -p build && cd build && cmake -DCMAKE_BUILD_TYPE=Release .. && make -j