How to make grass and load assets in Jeff's Map Creator?

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Here's a link to the Wiki:

github.com/donutteam/jeffs-map-creator/wiki

For Loading assets check:
github.com/donutteam/jeffs-map-creator/wiki/Static-Entity-and-Intersects
github.com/donutteam/jeffs-map-creator/wiki/Textures-and-Shaders