Add doc on keyboard shortcut (#14)

* Add doc on keyboard shortcut

Also add doc on the "OK" update on the icon.

* Update README.md

Corrected default for Mac is also Alt-r (aka Opt-r)

README.md

@@ -6,11 +6,14 @@ The extension is available for download [here].
 
 If you've ever developed a Google Chrome™ extension, you might have wanted to automate the process of reloading your unpacked extension without the need of going through the extensions page.
 
-"Extensions Reloader" allows you to reload all unpacked extensions using 2 ways:
+"Extensions Reloader" allows you to reload all unpacked extensions using three ways:
 
 1. The extension's toolbar button.
-2. Browsing to "http://reload.extensions".
 
-The "reload by browsing" is intended for automating the reload process using "post build" scripts - just browse to "http://reload.extensions", and chrome will open with freshly reloaded extensions.
+2. Browsing to "http://reload.extensions". This is intended for automating the reload process using "post build" scripts - just browse to "http://reload.extensions", and chrome will open with freshly reloaded extensions.
+
+3. Using the keyboard shortcut (default is Alt-r or Opt-r on Mac).
+
+Whenever a refresh is executed, a green "OK" badge will appear on Extensions Reloader's toolbar icon.
 
 [here]:https://chrome.google.com/webstore/detail/fimgfedafeadlieiabdeeaodndnlbhid