Added comments to start script (arriven#134)

scripts/StartDB1000N.bat

@@ -1,21 +1,30 @@
+rem First we write PowerShell script to separate file, since it's easier to do download from github with powershell
+rem Parsing command line argument to get target download folder
 echo $SaveFolder = $args[0]                                                       >  %temp%\GetDB1000N.ps1
 echo if ($args.count -lt 1)                                                       >> %temp%\GetDB1000N.ps1
 echo {                                                                            >> %temp%\GetDB1000N.ps1
 echo 	Write-Host "Missing save folder parameter"                                >> %temp%\GetDB1000N.ps1
 echo }                                                                            >> %temp%\GetDB1000N.ps1
+rem Create target folder if it don't exist yet
 echo New-Item -ItemType Directory -Force -Path $SaveFolder                        >> %temp%\GetDB1000N.ps1
+rem Getting list of files in latest release via github API and parse response JSON
 echo $JSONURL = "https://api.github.com/repos/Arriven/db1000n/releases/latest"    >> %temp%\GetDB1000N.ps1
 echo $JSON = Invoke-WebRequest -Uri $JSONURL                                      >> %temp%\GetDB1000N.ps1
 echo $ParsedJSON = ConvertFrom-Json -InputObject $JSON                            >> %temp%\GetDB1000N.ps1
 echo $Assets = Select-Object -InputObject $ParsedJSON -ExpandProperty assets      >> %temp%\GetDB1000N.ps1
+rem Iterate over list of all files in release
 echo Foreach ($Asset IN $Assets)                                                  >> %temp%\GetDB1000N.ps1
 echo {                                                                            >> %temp%\GetDB1000N.ps1
+rem Search for windows x64 build with regex
 echo 	if ($Asset.name -match 'db1000n-.*-windows-amd64.zip')                    >> %temp%\GetDB1000N.ps1
 echo 	{                                                                         >> %temp%\GetDB1000N.ps1
+rem Download found build
 echo 		$DownloadURL = $Asset.browser_download_url                            >> %temp%\GetDB1000N.ps1
 echo 		$ZIPPath = Join-Path -Path $SaveFolder -ChildPath "db1000n.zip"       >> %temp%\GetDB1000N.ps1
 echo 		Invoke-WebRequest -Uri $DownloadURL -OutFile $ZIPPath                 >> %temp%\GetDB1000N.ps1
+rem Extract downloaded archive
 echo 		Expand-Archive -Path $ZIPPath -DestinationPath $SaveFolder -Force     >> %temp%\GetDB1000N.ps1
+rem Delete original archive file
 echo 		Remove-Item -Path $ZIPPath                                            >> %temp%\GetDB1000N.ps1
 echo 		Write-Host "Sucessfully downloaded DB1000N $($Asset.name)"            >> %temp%\GetDB1000N.ps1
 echo 		exit 0                                                                >> %temp%\GetDB1000N.ps1
@@ -24,5 +33,8 @@ echo }
 echo Write-Host "Something went wrong, couldn't download DB1000N"                 >> %temp%\GetDB1000N.ps1
 echo exit 1                                                                       >> %temp%\GetDB1000N.ps1
 
+rem Download latest windows x64 build
+rem We don't currently check if it's already downloaded, so it redownload latest version each run
 powershell -ExecutionPolicy Bypass -File %temp%\GetDB1000N.ps1 %temp%
+rem Assume that archive contained executable file named db1000n.exe and try to run it
 %temp%/db1000n.exe