cmds added

Author: ulf1

README.md

@@ -24,6 +24,8 @@ python3.6 -m venv .venv
 source .venv/bin/activate
 pip install --upgrade pip
 pip install -r requirements.txt
+pip install -r requirements-dev.txt
+pip install -r requirements-demo.txt
 ```
 
 (If your git repo is stored in a folder with whitespaces, then don't use the subfolder `.venv`. Use an absolute path without whitespaces.)