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  Warmup: Make a grid that hides/shows 

  Review some fundamentals of p5.js

  - draw a grid using for loops

  - show grid only if a mouse is pressed

  - use a variable to change the size of the cells.

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*/

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//define a cell size

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function setup() {

  createCanvas(400, 400);

}

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function draw() {

  background(220);

  //call a drawGrid function

}

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//define a drawGrid function

//It should use two for loops to draw vertical and horizontal lines.

// How many times should the for loop reapeat? think of the cell size!

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