Make mobile friendly 📱

[AmanRaj1608]

• Add 4 buttons for up down left right
• When screen size is less than 600px display it

[readmey]

is this still valid ? if yes, I could do it

[AmanRaj1608]

@readmey Yes please go ahead and create a PR

[readmey]

@AmanRaj1608 can i update the description that you can draw with the mouse too. Currently the description only says that you can draw with the keyboard input.