[Android] `dotnet new android-fsharp` should create a copy of net6.0-android-fsharp

[TimLariviere]

Following this documentation: https://docs.microsoft.com/en-us/dotnet/core/tutorials/cli-templates-create-project-template

We need to package net6.0-android-fsharp as a template compatible with dotnet new.
Ideally, we will be able to do: dotnet new android-fsharp -n MyAndroidApp

[TimLariviere]

FYI @gsomix

[gsomix]

@TimLariviere OK, I'm on it.