Install Azure Cosmos DB Emulator on AppVeyor

appveyor.yml

install:
- ps: Start-FileDownload 'https://aka.ms/cosmosdb-emulator' -FileName 'c:\projects\cosmos-db.msi'
- cmd: cmd /c start /wait msiexec /i "c:\projects\cosmos-db.msi" /qn /quiet /norestart /log install.log  
- ps: Start-Process "start-emulator.cmd"
- ps: .\wait-connect-cosmosdb.ps1

start-emulator.cmd

"C:\Program Files\Azure Cosmos DB Emulator\CosmosDB.Emulator.exe"  /NoExplorer /NoUI

wait-connect-cosmosdb.ps1

$attempt = 0; $max = 5
$client = New-Object System.Net.Sockets.TcpClient([System.Net.Sockets.AddressFamily]::InterNetwork)

do {
	try {    
		$client.Connect("127.0.0.1", 8081)
		write-host "CosmosDB started"
	}
	
	catch {
		$client.Close()
		if($attempt -eq $max) {
			write-host "CosmosDB was not started"
		} else {
			[int]$sleepTime = 5 * (++$attempt)
			write-host "CosmosDB is not started. Retry after $sleepTime seconds..."
			sleep $sleepTime;
		}
	}
}while(!$client.Connected -and $attempt -lt $max)