Add notes from setting up toolchain

I somehow managed to get it working in a VM, so here are some notes…

TOOLCHAIN_NOTES

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+# Here are several notes on how I managed to get xamarin.android working.
+# OS: Linux Mint 20.3 Mate x86_64
+# Downloaded Android Studio, Added Mono, installed a lot of random packages, Android SDKs, etc.
+# Xamarin.Android taken from the pipeline artifact
+# Did some weird hacks with environment (TODO)
+# Did awful things to the dotnet instalation:
+# SO: https://askubuntu.com/questions/1177970/how-to-develop-for-android-with-xamarin
+
+for x in /usr/lib/xamarin.android/xbuild/*; do ln -s $x /usr/share/dotnet/sdk/6.0.200/`basename $x`; done
+for x in /usr/lib/xamarin.android/xbuild-frameworks/*; do ln -s $x /usr/share/dotnet/packs/`basename $x`; done
+
+# Found some commands to be semi-working
+
+dotnet build -p:TargetFrameworkRootPath=/usr/lib/xamarin.android/xbuild-frameworks/
+
+
+nuget restore # In solution directory
+msbuild /t:Build,Install # In project directory
+# Launch yourself...
+
+clean:
+	git clean -fxd `git rev-parse --show-toplevel`
+	git submodule foreach --recursive git clean -fxd