In Sobon's " Build a Classic Timber Framed House" there was a shed addition built on the project house. On page 167 of the book you can find a good visual of the shed rafter to girt connections.On another point, be aware that any that step between the main roof and shed roof could create a snow catch, which could lead to future water issues. So if you do have step in roof sections make sure you have proper flashing and counter flashing.