Added build script for Windows Builds

Build-JellyFin.ps1

@@ -0,0 +1,64 @@
+[CmdletBinding()]
+param(
+    [switch]$InstallFFMPEG,
+    [string]$InstallLocation = "$Env:AppData\JellyFin-Server\",
+    [ValidateSet('Debug','Release')][string]$BuildType = 'Release',
+    [ValidateSet('Quiet','Minimal', 'Normal')][string]$DotNetVerbosity = 'Minimal',
+    [ValidateSet('win','win7', 'win8','win81','win10')][string]$WindowsVersion = 'win',
+    [ValidateSet('x64','x86', 'arm', 'arm64')][string]$Architecture = 'x64'
+)
+function Build-JellyFin {
+    if($Architecture -eq 'arm64'){
+        if($WindowsVersion -ne 'win10'){
+            Write-Error "arm64 only supported with Windows10 Version"
+            exit
+        }
+    }
+    if($Architecture -eq 'arm'){
+        if($WindowsVersion -notin @('win10','win81','win8')){
+            Write-Error "arm only supported with Windows 8 or higher"
+            exit
+        }
+    }
+    dotnet publish -c $BuildType -r "$windowsversion-$Architecture" .\MediaBrowser.sln -o $InstallLocation -v $DotNetVerbosity
+}
+
+function Install-FFMPEG {
+    param(
+        [string]$InstallLocation,
+        [string]$Architecture
+    )
+    Write-Verbose "Checking Architecture"
+    if($Architecture -notin @('x86','x64')){
+        Write-Warning "No builds available for your selected architecture of $Architecture"
+        Write-Warning "FFMPEG will not be installed" 
+    }elseif($Architecture -eq 'x64'){
+         Write-Verbose "Downloading 64 bit FFMPEG"
+         Invoke-WebRequest -Uri https://ffmpeg.zeranoe.com/builds/win64/static/ffmpeg-4.1-win64-static.zip -UseBasicParsing -OutFile $env:TEMP\fmmpeg.zip | Write-Verbose
+    }else{
+         Write-Verbose "Downloading 32 bit FFMPEG"
+         Invoke-WebRequest -Uri https://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-4.1-win32-static.zip -UseBasicParsing -OutFile $env:TEMP\fmmpeg.zip | Write-Verbose
+    }
+   
+    Expand-Archive $env:TEMP\fmmpeg.zip -DestinationPath $env:TEMP\ffmpeg\ | Write-Verbose
+    if($Architecture -eq 'x64'){
+        Write-Verbose "Copying Binaries to Jellyfin location"
+        Get-ChildItem "$env:temp\ffmpeg\ffmpeg-4.1-win64-static\bin" | ForEach-Object {
+            Copy-Item $_.FullName -Destination $installLocation | Write-Verbose
+        }
+    }else{
+        Write-Verbose "Copying Binaries to Jellyfin location"
+        Get-ChildItem "$env:temp\ffmpeg\ffmpeg-4.1-win32-static\bin" | ForEach-Object {
+            Copy-Item $_.FullName -Destination $installLocation | Write-Verbose
+        }
+    }
+    Remove-Item $env:TEMP\ffmpeg\ -Recurse -Force -ErrorAction Continue | Write-Verbose
+    Remove-Item $env:TEMP\fmmpeg.zip -Force -ErrorAction Continue | Write-Verbose
+}
+Write-Verbose "Starting Build Process: Selected Environment is $WindowsVersion-$Architecture"
+Build-JellyFin
+if($InstallFFMPEG.IsPresent -or ($InstallFFMPEG -eq $true)){
+    Write-Verbose "Starting FFMPEG Install"
+    Install-FFMPEG $InstallLocation $Architecture
+}
+Write-Verbose "Finished"