💚 Add .gitlab-ci.yml

.gitlab-ci.yml

+image: "pmem/pmdk:1.7-fedora-28"
+
+stages:
+  - build
+  - test
+
+before_script:
+  - dnf update -y
+  - mkdir -p /mnt/pmem/test
+  - chmod 777 /mnt/pmem/test
+
+build:
+  stage: build
+  script:
+    - mkdir build
+    - cd build
+    - cmake ../src
+    - make -j
+
+test:
+  stage: test
+  script:
+    - ctest
+