Ajouter 'Build it yourself'

Build-it-yourself.md

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+## Build it yourself
+
+The software is automatically build using Drone but if you want to manually build it, here are the instructions.
+
+```bash
+# Build on Debian
+git clone <url of this repo>
+cd ProxmoxDeploy
+apt update && apt install -y build-essential patchelf
+pip install nuitka
+pip install -r requirements.txt
+python -m nuitka --onefile run.py --output-filename="ProxmoxDeploy"
+```
+*Also see the ``Dockerfile`` and ``.drone.yml`` for more information.*
+
+## Run it
+```bash
+# Run it
+./ProxmoxDeploy --help
+```