Add note about optional feature flags

README.md

@@ -39,6 +39,25 @@ ansible-pull -U https://code.fbi.h-da.de/pse-ai-at-the-edge/raspberry-pi-setup.g
 
 # Notes
 
+## Changing optional settings
+
+There are a bunch of optional settings in the script with default values that can be changed if needed. When running the script on a normal Pi with the default user, there is no need to change any of those.
+
+The configurable options are the following:
+
+| Variable name         | Default value | Description |
+|:----------------------|:--------------|:------------|
+| target_user           | pi            | Setup for a specified user |
+| jupyter_service       | true          | Setup a systemd service to autostart jupyterlab in the background |
+| jupyter_start         | true          | Don't start jupyterlab directly |
+| ignore_python_version | false         | Ignore the python version check (**not recommended**) |
+| ignore_architecture   | false         | Ignore the architecture check (**not recommended**) |
+
+To change any of these values add `-e "[var1]=[value1] [var2]=[value2]"` to the `ansible-pull` command. 
+
+**Important:** To set a value to `false` use `-e [var]=''` and **not** `-e [var]=false`. This is necessary due to ansible interpreting all extra-vars as strings.
+
+
 ## Raspberry Pi OS Version and Architecture
 This current version of the playbook will install a prebuilt `tensorflow-2.7` wheel that only works on `Python3.9` and the `Aarch64` architecture.
 That means for now the playbook **only works on Raspberry Pi OS 11 64-bit**