Added DocFX documentation

build/DownloadDocFX.ps1

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+[cmdletbinding()]
+param([string]$Version="2.48.1",[string]$Folder)
+Add-Type -AssemblyName System.IO.Compression.FileSystem
+[Net.ServicePointManager]::SecurityProtocol =[Net.SecurityProtocolType]::Tls12
+
+function DownloadDocFX([string]$version, [string]$folder)
+{
+   Write-Output "Using folder $folder"
+   $path = "$folder\v$version"
+   if (!(Test-Path $path)) 
+   {
+      New-Item -ItemType Directory -Force -Path $path
+      Write-Output "Downloading DocFX v$version..."
+      Invoke-WebRequest -Uri "https://github.com/dotnet/docfx/releases/download/v$version/docfx.zip" -OutFile "$folder\docfx_v$version.zip"
+      [System.IO.Compression.ZipFile]::ExtractToDirectory("$folder\docfx_v$version.zip",$path )
+   }
+}
+DownloadDocFX -version $Version -folder $Folder

build/GenerateDoc.cmd

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+@ECHO OFF
+
+SET DocFXVersion=2.48.1
+SET DocFxFolder=..\artifacts\toolset
+
+REM Download DocFx
+powershell -ExecutionPolicy ByPass -command "./DownloadDocFX.ps1" -Version %DocFXVersion% -Folder %DocFxFolder%
+
+REM Build metadata for all platforms (uses configuration in docfx.json in this folder)
+%DocFxFolder%\v%DocFXVersion%\docfx.exe ..\docs\docfx.json metadata
+
+REM Merge output (not implemented)
+REM %DocFxFolder%\v%DocFXVersion%\docfx.exe merge
+
+REM Generate OMD
+dotnet tool install --global dotMorten.OmdGenerator
+generateomd /source=../src/NmeaParser /output=../artifacts/docs/api/omd.html
+
+REM Build the output site (HTML) from the generated metadata and input files (uses configuration in docfx.json in this folder)
+%DocFxFolder%\v%DocFXVersion%\docfx.exe ..\docs\docfx.json build