first attempt to have tests (fake tests only)

First attempt to introduce style checks and running tests automatically.

.gitlab-ci.yaml

+image: python:latest
+
+stages:
+  - test-style
+  - test
+
+before_script:
+   - cat /etc/issue
+   - python -V
+   - which python
+   - python -m venv ../venv
+   - source ../venv/bin/activate
+   - which python
+   - pwd
+   - pip install -U pip
+   - pip --version
+   - pip install pytest
+   - pytest --version
+
+  
+style:
+  stage: test-style
+  image: python:latest
+  script:
+    - black --version
+    - ruff --version
+    - ruff .
+    - black --check --diff .
+
+
+test3-09:
+  stage: test
+  image: python:3.9
+  script:
+    - echo "run tests here later"
+    - python --version
+
+test3-10:
+  stage: test
+  image: python:3.10
+  script:
+    - echo "run tests here later"
+    - python --version
+
+
+test3-11:
+  stage: test
+  image: python:3.11
+  script:
+    - echo "run tests here later"
+    - python --version
+