Add custom made game assets in format 16x16 px

Although we already have sprites and tiles, we still need more (because you can't have enough of them)

If you are a designer, go for it an create your own sprites and add them. As you can see in the existing assets of the game, we have a unique style.

You can create objects, characters, furniture, etc for us to place into the game. This is a non-code issue/task. So feel free if you don't exactly know how to contribute by code, to add assets.

Best place to add them would be in the public folder. We will figure out the final place later on.