[product] Add a demo notebook

examples/projects/product/README.md

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+
+# The complete product example :bulb:
+
+This project demonstrate how to deal with a real life project using Luos_engine. This project deal with custom project type, custom message commands, and demonstrate how to adapt your gate and pyluos to properly handle it.
+
+This project is a laser Galvo controller that can be use in an engraving machine, a small surface laser cutter or a laser show device.
+This have been tested with the great [interface board made by the opengalvo OPAL project](https://github.com/leswright1977/OPAL_PCB)
+
+This product is composed of multiple nodes:
+
+- A gate node called `custom_gate` running on your computer
+- A laser Galvo node called `laser_galvo` running on a microcontroller (tested on nucleo_l476rg but should work on most of the STM32 family)
+
+## How to use :computer:
+
+1.  Download and install [Platformio](https://platformio.org/platformio-ide)
+2.  Open the `custom_gate` folder into Platformio
+3.  Build (Platformio will do the rest)
+4.  Open the `laser_galvo` folder into Platformio
+5.  Build and flash the board (Platformio will do the rest) (of course your board with the galvo should be connected to your computer)
+6.  Run the `custom_gate` program in `custom_gate/.pio/build/native_serial/program` (or `custom_gate/.pio/build/native_serial/program.exe` if you use windows)
+7.  Install python requirements with `pip install -r requirements.txt`
+8.  Then you can play with the Ipython notebook `laser_galvo_control.ipynb` to control the laser Galvo
+
+## Don't hesitate to read [our documentation](https://www.luos.io/docs/luos-technology), or to post your questions/issues on the [Luos' community](https://discord.gg/luos). :books:
+
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