An EA for MT4 with one indicator

I have an indicator, which gives buy and sell signals providing one colour for buy trend, and another colour for sell trend

Signals are valid when candle closes!

When the first purple candle show up , and candle close, open SELL trade …….then, whenever a blue candle show up , and candle close , close the sell trade , and open buy trade .

AS SIMPLE AS THAT

And close it when the opposite signal appears and candle closes

So, its OPEN/CLOSE on opposite signal WHEN CANDLE CLOSES

Properties of the EA :

-        LOT SIZE

No more than one trade at a time allowed!

I will require mq4 file to be sent to me once job is completed.