EMA Crossover Alert

أول أمسThe script calculates two EMAs, one short-term (shortEma) and one long-term (longEma).
It then checks for bullish and bearish crossovers.
Bullish Crossover: The short EMA crosses above the long EMA.
Bearish Crossover: The short EMA crosses below the long EMA.
Alerts are generated when either crossover occurs.