Add links to staging binary

Author: facchinm

README.md

@@ -5,13 +5,12 @@ Version X.XX
 
 Get the latest version of the Agent for all supported platforms:
 
-[Linux x64](http://downloads.arduino.cc/CreateBridge/ArduinoCreateAgent-1.0-linux-x64-installer.run)
-
-[MacOSX](http://downloads.arduino.cc/CreateBridge/ArduinoCreateAgent-1.0-osx-installer.dmg)
-
-[Windows](http://downloads.arduino.cc/CreateBridge/ArduinoCreateAgent-1.0-windows-installer.exe)
-
+|  |  |  |
+| ------------- | ----------- | -------- |
+| Windows | [stable](http://downloads.arduino.cc/CreateBridge/ArduinoCreateAgent-1.0-windows-installer.exe) | [staging](http://downloads.arduino.cc/CreateBridge/staging/ArduinoCreateAgent-1.0-windows-installer.exe) |
+| MacOSX | [stable](http://downloads.arduino.cc/CreateBridge/ArduinoCreateAgent-1.0-osx-installer.dmg) | [staging](http://downloads.arduino.cc/CreateBridge/staging/ArduinoCreateAgent-1.0-osx-installer.dmg) |
+| Linux x64 | [stable](http://downloads.arduino.cc/CreateBridge/ArduinoCreateAgent-1.0-linux-x64-installer.run) | [staging](http://downloads.arduino.cc/CreateBridge/staging/ArduinoCreateAgent-1.0-linux-x64-installer.run) |
 
 arduino-create-agent is a fork of @johnlauer's serial-port-json-server (which we really want to thank for his kindness and great work)
 
-The history has been rewritten to keep the repo small (thus removing all binaries committed in the past)
+The history has been rewritten to keep the repo small (thus removing all binaries committed in the past)