extended instructions (#1583)

Co-authored-by: CaCO3 <caco@ruinelli.ch>

README.md

@@ -58,6 +58,9 @@ There are different ways to flash your ESP32:
 
 See the [Wiki](https://github.com/jomjol/AI-on-the-edge-device/wiki/Installation) for more information.
 
+### Flashing the SD-Card
+The SD-Card must be flashed separately, see the [Wiki](https://github.com/jomjol/AI-on-the-edge-device/wiki/Installation) for details.
+
 ## Casing
 
 A 3d-printable housing can be found here:

docs/index.html

@@ -27,6 +27,7 @@
       <p>Notes:</p>
       <ul>
          <li>For the installation, make sure to switch the ESP32 to Bootloader mode!</li>
+         <li>The SD-Card still must be flashed separately on a PC (See in the <a href=https://github.com/jomjol/AI-on-the-edge-device/wiki/Installation>Wiki</a>)!</li>
          <li>After the installation, a manual reset might be required!</li>
          <li>Please note that not all webbrowsers and operating systems support the needed access to USB!</li>
          <li>Check the <a href=https://github.com/jomjol/AI-on-the-edge-device/wiki/Installation>Wiki</a> for additional information.</li>