EA based on two moving averages

I need a EA, that works with two moving averages, one 50 and other 20, and the action will happen at the cross of these two moving averages.

when the lines are going up and they cross, it will sell AND KEEP the transaction UNTIL IT CROSS AGAIN.

The same for opposite: when the lines are going down and they cross, it will buy AND KEEP the transaction UNTIL IT CROSS AGAIN.

It's not supposed to use SL nor TP, it's going to close at the next cross.

At the cross, two actions are supposed to happen:

• if it's bought, it has to close the transaction and open a SELL

• if it's sold, it has to close the transaction and open a BUY

And that's supposed to happen EVERY SINGLE COSS, like the image