Document how to increase pystack size for CircuitPython installations

Author: malcolm-sparkfun

README.md

@@ -92,11 +92,15 @@ Ensure that you have the latest version of the SparkFun Qwiic CircuitPython bund
 circup bundle-add sparkfun/Qwiic_Py
 ```
 
-Finally, connect a device with CircuitPython installed to your computer and then install the package directly to your device with circup.
+Then, connect a device with CircuitPython installed to your computer and then install the package directly to your device with circup.
 ```sh
 circup install --py qwiic_oled
 ```
 
+> [!NOTE]
+> This library requires a decent stack size in order to run. In a file named "settings.toml" in the base directory on your CircuitPython board,
+> add the following line: ```CIRCUITPY_PYSTACK_SIZE=12288```. If you don't perform this step you will likely get "pystack exhausted" errors when trying to use these modules.
+
 If you would like to install any of the examples from this repository, issue the corresponding circup command from below. (NOTE: The below syntax assumes you are using CircUp on Windows. Linux and Mac will have different path seperators. See the [CircUp "example" command documentation](https://learn.adafruit.com/keep-your-circuitpython-libraries-on-devices-up-to-date-with-circup/example-command) for more information)
 
 ```sh