CI: Simple GitLab CI file added

For a more complex example I refer to the petrinet CI setup

.gitlab-ci.yml

@@ -0,0 +1,25 @@
+image: gcc
+
+stages:
+    - build
+    - simple-runs
+
+cache:
+    paths:
+        - build/
+
+build:
+    stage: build
+    script:
+        - git submodule sync
+        - git submodule update --init --recursive
+        - mkdir -p build
+        - cd build
+        - qmake ../DRAMSys/DRAMSys.pro
+        - make -j4
+    
+check-for-crash:
+    stage: simple-runs
+    script:
+        - cd build/simulator
+        - ./DRAMSys