improve readme, add venv to gitignore

.gitignore

 __pycache__
 /textual.log
 /.venv*
+/venv*
 /.zapper-data
 *.prof
+
+

README.md

 # AutPy GUI commander
 
+Make sure the submission repo is located next to this repo. Example:
+
+AutPy/  
+├─ commander/  
+├─ submissions-hs23/  
+
 Install dependencies from `requirements.txt`, then run with `python -m commander.gui`.