Update README with image

Author: nsarrazin

README.md

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 # Spesscomputer
 
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 ### Compile godot
 
 We use godot with custom [large world coordinates](https://docs.godotengine.org/en/stable/tutorials/physics/large_world_coordinates.html). This requires [compiling godot from source](https://docs.godotengine.org/en/stable/contributing/development/compiling/index.html#toc-devel-compiling).