Update tuto_nmigen.md

tuto_nmigen.md

 # Nmigen Tutorial
+
+**Python version used :** Python 3.8.5
+
+## Installation
+
+**Nmigen :**
+
+Click on [this link][1] to access a Github containing all the information needed to install Nmigen on different operating systems and other tools to interact with the FPGA card.
+
+[1]: https://github.com/RobertBaruch/nmigen-tutorial
+
+---
+
+During the installation of Next-PNR, we faced some issues that were solved using the following command lines :
+
+*#NIX installation*
+
+`curl -L https://nixos.org/nix/install | sh`
+
+*#Creation of a shell containing the dependencies expected in the PATH, run this line for each new shell (it is faster after the first time because every files will already exist)*
+
+`nix-shell -p icestorm nextpnr yosys 'python3.withPackages (ps: with ps; [ nmigen nmigen-boards ])'`
+
+*#Test on examples*
+
+`git clone https://github.com/icebreaker-fpga/icebreaker-nmigen-examples.git`
+
+`cd  icebreaker-nmigen-examples/blink`
+
+`python3 blink.py`
+
+---
+
+Note that you need to replace these terms :
+
+*-from nmigen_boards.icebreaker -> nmigen_boards.icestick*
+
+*- ICEBreakerPlatform -> ICEStickPlatform*
+
+*- led = platform.request("led_r") -> led = platform.request("led")*