add readme

README.md

+# pytest-basics
+
+* master -- ![](https://gitlab.cesnet.cz/radoslav_bodo/pytest-basics/badges/master/pipeline.svg)
+* devel -- ![](https://gitlab.cesnet.cz/radoslav_bodo/pytest-basics/badges/devel/pipeline.svg)
+
+```
+git clone
+make install-dev
+. venv/bin/activate
+make
+```