Update README.md

add screencap of Cura window with Printer set up completed.

Author: tracedgod

README.md

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 # FlashForge Dreamer Cura Definitions (Dual Extruder)
+ ![Cura_GUI_Preview](https://user-images.githubusercontent.com/6174563/210188426-f8184396-4bbb-4e73-81b5-0a15ae26cad3.png)
 
 ## **_DISCLAIMER_**
 All information is provided "as is", with no guarantee of
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- ```
+ ```