As a user, I can: a. add rows to the grid
b. add columns to the grid remove rows from the grid remove columns from the grid
c. select a color from a dropdown menu of colors
d. click on a single cell, changing its color to the currently selected color
e. fill all uncolored cells with the currently selected color
f. fill all cells with the currently selected color
g. clear all cells/restore all cells to their original/initial color
h. click and hold (mouseover) from a single cell (start) to a different cell (end) such that all affected/hovered-over cells from start to end change to the currently selected color