Add Windows version of running cmd

docs/tutorial/using-native-node-modules.md

@@ -33,6 +33,9 @@ npm install --save-dev electron-rebuild
 
 # Every time you run "npm install", run this
 ./node_modules/.bin/electron-rebuild
+
+# On Windows if you have trouble, try:
+.\node_modules\.bin\electron-rebuild.cmd
 ```
 
 ### The npm Way