add .bat file for easier debugging on console

(see https://bugs.openjdk.java.net/browse/JDK-8253461)

dist/win/contrib/cryptomator.bat

@@ -0,0 +1,12 @@
+@echo off
+java ^
+	-p "app/mods" ^
+	-cp "app/*" ^
+	-Dcryptomator.settingsPath="~/AppData/Roaming/Cryptomator/settings.json" ^
+	-Dcryptomator.ipcSocketPath="~/AppData/Roaming/Cryptomator/ipc.socket" ^
+	-Dcryptomator.logDir="~/AppData/Roaming/Cryptomator" ^
+	-Dcryptomator.mountPointsDir="~/Cryptomator" ^
+	-Dcryptomator.keychainPath="~/AppData/Roaming/Cryptomator/keychain.json" ^
+	-Xss20m ^
+	-Xmx512m ^
+	-m org.cryptomator.desktop/org.cryptomator.launcher.Cryptomator