Imported wiki (#2)

* imported wiki

* updated image paths

* .

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

docs/Demo-Mode.md

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+For Demo and Testing Purpose, the device can use pre-recorded images.
+
+You need to enable it in the configuration (`TakeImage > Demo`) and also provide the needed files on the SD-Card.
+
+One image per round gets used, starting with the first image for the first round.
+
+For the reference image and the alignment also the first image gets used.
+
+Once the last image got reached, it starts again with the first one.
+
+## Example Demo
+You can use the following demo or create your own one.
+Just install it using the OTA Update functionality.
+
+ - [demo.zip](https://github.com/jomjol/AI-on-the-edge-device/files/10320454/demo.zip) (this is just a zip of [this](https://github.com/jomjol/AI-on-the-edge-device/tree/master/code) folder in the repo)
+
+
+## SD-Card Structure
+```
+demo/
+├── 520.8983.jpg
+├── 520.9086.jpg
+├── 520.9351.jpg
+├── ...
+└── files.txt
+```
+
+- The jpg files can have any name
+- The jpg files must be smaller than 30'000 bytes
+- The `files.txt` must contains a list of those files, eg:
+  ```
+  520.8983.jpg
+  520.9086.jpg
+  520.9351.jpg
+  ```
+
+## Recoding
+To record real images of a meter, you have to periodically fetch `http://<IP>/img_tmp/raw.jpg`.
+
+To automate this, you can use the following shell script (Linux only):
+```bash
+#!/bin/bash
+
+while [[ true ]]; do
+    echo "fetching value..."
+    wget -q http://192.168.1.151/value -O value.txt
+
+    value=`cat value.txt`
+    echo "Value: $value"
+    
+    diff=`diff value.txt value_previous.txt`
+    changed=$?
+    #echo "Diff: $diff"
+    
+    if [[ $changed -ne 0 ]]; then
+        echo "Value changed:"
+        echo $diff
+        echo "fetching image..."
+        wget -q http://192.168.1.151/img_tmp/raw.jpg -O $value.jpg
+    else
+        echo "Value did not change, skipping image fetching!"
+    fi
+    
+    cp value.txt value_previous.txt
+    
+    echo "waiting 60s..."
+    sleep 60
+done
+```
+
+## How does it work
+The Demo Mode tries to interfere as less as possible with the normal behavior. Whenever a Cam Framebuffer gets taken (`esp_camera_fb_get()`), it replaces the framebuffer with the image from the SD-Card.