add: README with screenshot

README.md

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+Stage Lighting Control Software, Movingheads, Movinglights, Dimmer, LED, Spotlight, Washlight 
+
+![LibreLightScreen](https://user-images.githubusercontent.com/98694752/152388271-54c6e915-0357-47d5-9d1c-f0c71ea8fa12.png)