RayCastingTutorial

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Hi @vinibiavatti1, thank you for tutorial. I liked it. I didn't find minimap in basic raycaster example so I decided to implement it. This minimap can be used anywhere in screen. Minimap disabled as default so it needs to be toggled by user. It has 2 options, grid and transparency. Grid option draws grids over map. Transparency option decides whether you use background or not. I tried to make it similar as shown in tutorial.