Add Gitlab CI script for testing the program

.gitlab-ci.yml

+image:
+  name: cp1_testing_image_ex1:latest
+
+stages:
+  - test
+
+
+# Testing the stuff
+test_task1:
+  stage: test
+  tags:
+    - task_check
+  script: make test_task1
+
+
+test_task2:
+  stage: test
+  tags:
+    - task_check
+  script: make test_task2
+
+
+test_task3:
+  stage: test
+  tags:
+    - task_check
+  script: make test_task3
+
+
+test_task4:
+  stage: test
+  tags:
+    - task_check
+  script: make test_task4
+
+
+test_task4:
+  stage: test
+  tags:
+    - task_check
+  script: make test_task4