Added docs

src/server/readme.md

-# This documents how to run the server on a Raspberry PI (3B)
+# Server documentation
+
+For simple use and installation, the server services are empacted into a docker-compose. There will be containers for:
+- mosquitto (MQTT broker)
+- Nodered (No code web based programming tool)
+
+> The first 2 steps can be skipped if you're using an other server and dont need to install raspbian and docker. (You'll only need docker, docker-compose ) 
 
 ## Install raspbian on the PI
 We need to install a linux on the PI.
 
 Download the Raspberry PI Imager on [https://www.raspberrypi.com/software/](https://www.raspberrypi.com/software/)
 
-or on Ubuntu with :
+
+- Select the base raspbian image or similar (needs to be debian based for the exact commands to work)
+- Select your SD card
+- Configure Wifi and ssh for simpler use (Click on the bot right gear)
+- Write
+
+
+![installer.png](installer.png)
+
+
+
+## Install Docker and docker compose on the PI
+Source : [https://docs.docker.com/engine/install/raspbian/](https://docs.docker.com/engine/install/raspbian/)
+
+
 ```bash
-sudo apt-install rpi-imager
-```
+sudo apt-get update
+sudo apt-get install ca-certificates curl gnupg
+
+sudo install -m 0755 -d /etc/apt/keyrings
+curl -fsSL https://download.docker.com/linux/raspbian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+sudo chmod a+r /etc/apt/keyrings/docker.gpg
 
-https://docs.docker.com/engine/install/raspbian/
+echo \
+  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/raspbian \
+  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
+  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
 
 
+sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+sudo systemctl enable docker
+```
+
+Test the installation :
+```bash
+sudo docker run hello-world
+```
+
 
 
 ## Install and run
-Install docker-compose
 
 Go into the server directory, you should have this file structure:
 ```bash
@@ -54,19 +89,4 @@ docker-compose down
 Get into the container's shell:
 ```bash
 docker exec -it server bash
-```
-
-https://nodered.org/docs/user-guide/runtime/adding-nodes
-```
-package.json     # Additonnal packages
-flows.json       # the normal place Node-RED store your flows
-flows_cred.json  # credentials your flows may need
-settings.js      # your settings file
-```
-
-Add a npm package
-
-Install image processing tool:
-```bash
-npm install node-red-contrib-image-tools 
 ```
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