Warn about installing VS Code in WSL

resources/linux/bin/code.sh

@@ -3,6 +3,15 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License. See License.txt in the project root for license information.
 
+# test that VSCode wasn't installed inside WSL
+if grep -qi Microsoft /proc/version; then
+	echo "To use VS Code with the Windows Subsystem for Linux, please install VS Code in Windows and uninstall the Linux version in WSL. You can then use the '@@PRODNAME@@' command in a WSL terminal just as you would in a normal command prompt." 1>&2
+	read -e -p "Do you want to continue anyways ? [y/N] " YN
+
+	[[ $YN == "n" || $YN == "N" || $YN == "" ]] && exit 1
+fi
+
+
 # If root, ensure that --user-data-dir or --file-write is specified
 if [ "$(id -u)" = "0" ]; then
 	for i in $@