portable installation (#306)

install-portable.bat

@@ -0,0 +1,27 @@
+@echo off
+
+set sel="Select folder to place installation of portable wsltty"
+
+for /f "usebackq delims=" %%f in (`powershell "(new-object -COM Shell.Application).BrowseForFolder(0, '%sel%', 0, 0).self.path"`) do set f=%%f
+set instdir=%f%\wsltty
+
+if "%f%"=="" (
+	echo no installation
+	exit
+) else if not exist "%f%" (
+	echo invalid installation folder %instdir%
+	exit
+)
+
+call install "%instdir%" "%instdir%" /P
+
+rem create shortcut
+cd /D "%instdir%"
+set instpath=%instdir:~2%
+set target=%%COMSPEC%%
+set minttyargs=/C bin\mintty.exe --WSL= --icon=/wsl.ico --configdir=. -~
+set bridgeargs= -
+set wdir=%instpath%
+set icon=%instpath%\wsl.ico
+cscript /nologo mkshortcut.vbs "/name:WSL Terminal Portable"
+