Add CI

.gitlab-ci.yml

+image: debian:testing-slim
+
+before_script:
+  - apt update && apt install -y libhts3 zlib1g libsdsl3
+
+build:
+  stage: build
+  before_script:
+    - apt update && apt install -y make g++ libsdsl-dev libhts-dev zlib1g-dev
+  script:
+    - make
+    - make -C tests
+  artifacts:
+    paths:
+      - tests/test_bam
+      - tests/test_read_file
+
+test:
+  stage: test
+  script:
+    - cd tests
+    - ./test_bam
+    - ./test_read_file
+
+