Added PowerShell start script with loop capability, mainly useful for Win10 users (#240)

start.ps1

@@ -0,0 +1,40 @@
+param (
+	[switch]$Loop = $false
+)
+
+if(Test-Path "bin\php\php.exe"){
+	$env:PHPRC = ""
+	$binary = "bin\php\php.exe"
+}else{
+	$binary = "php"
+}
+
+if(Test-Path "PocketMine-MP.phar"){
+	$file = "PocketMine-MP.phar"
+}elseif(Test-Path "src\pocketmine\PocketMine.php"){
+	$file = "src\pocketmine\PocketMine.php"
+}else{
+	echo "Couldn't find a valid PocketMine-MP installation"
+	pause
+	exit 1
+}
+
+function StartServer{
+	$command = $binary + " " + $file + " --enable-ansi"
+	iex $command
+}
+
+$loops = 0
+
+StartServer
+
+while($Loop){
+	if($loops -ne 0){
+		echo ("Restarted " + $loops + " times")
+	}
+	$loops++
+	echo "To escape the loop, press CTRL+C now. Otherwise, wait 5 seconds for the server to restart."
+	echo ""
+	Start-Sleep 5
+	StartServer
+}