Really simple project... Press the green flag. Press "t" to type. Press the down arrow to clear.
To make this, I made a list called "Notes". Then I made code that said when the flag was clicked, forever check if someone pressed "t" or the down arrow. If they pressed "t", ask them to type something and then add it to the list called "Notes". If they press the down arrow, delete everything from Notes. that's all it is. I made this 100% myself. Give all credit to Adam.
