Code install extensions instruction

Code/update.sh

@@ -1,2 +1,5 @@
 grep -v 'oauth' /Users/tom/Library/Application\ Support/Code/User/settings.json > ./User/settings.json
 code --list-extensions > ./list-extensions.txt
+
+# install extensions using:
+# cat list-extensions.txt | while read line; do code --install-extension "$line"; done