Set up basic test gh worklows (#79)

* Set up basic test gh worklows

* update file paths

* env check

* add env check

* Update requirements.txt

* simplify

* upd

appendix-A/02_installing-python-libraries/tests.py

@@ -0,0 +1,7 @@
+from python_environment_check import main
+
+
+def test_main(capsys):
+    main()
+    captured = capsys.readouterr()
+    assert "FAIL" not in captured.out