feat: Add Sunny Bands Strategy with risk management and trading rules

pinescripts/Sunny_Bands_Strategy.pine

@@ -0,0 +1,46 @@
+//@version=5
+strategy("Sunny Bands Strategy", shorttitle="SunnyB Strategy", overlay=true, margin_long=100, margin_short=100, default_qty_type=strategy.percent_of_equity, default_qty_value=100)
+
+// Strategy Inputs
+length = input.int(50, "DMA Length", group="Strategy Parameters")
+atr_multiplier = input.float(1.5, "ATR Multiplier", group="Strategy Parameters")
+smooth_factor = input.int(2, "Smoothing Factor", group="Strategy Parameters")
+stop_loss_mult = input.float(1.0, "Stop Loss (ATR)", group="Risk Management")
+take_profit_mult = input.float(2.0, "Take Profit (ATR)", group="Risk Management")
+trade_size_pct = input.float(100, "Position Size (% Equity)", step=10, group="Risk Management") / 100
+
+// Include original indicator logic
+ema1 = ta.ema(close, length)
+dma = ta.ema(ema1, smooth_factor)
+atr = ta.atr(length)
+upper_band = dma + (atr * atr_multiplier)
+lower_band = dma - (atr * atr_multiplier)
+
+// Strategy Calculations
+bullish_signal = ta.crossover(close, lower_band)
+bearish_signal = ta.crossunder(close, upper_band)
+price_at_entry = close
+stop_loss_level = price_at_entry - (atr * stop_loss_mult)
+take_profit_level = price_at_entry + (atr * take_profit_mult)
+
+// Strategy Rules
+if bullish_signal
+    strategy.entry("Long", strategy.long, qty=strategy.equity * trade_size_pct / close)
+    
+if strategy.position_size > 0
+    strategy.exit("Exit", "Long", 
+        stop=stop_loss_level, 
+        limit=take_profit_level)
+    
+if bearish_signal
+    strategy.close("Long")
+
+// Visual Elements
+plot(dma, "DMA", color=color.new(#009688, 0))
+plot(upper_band, "Upper Band", color=color.new(#FF5252, 0))
+plot(lower_band, "Lower Band", color=color.new(#4CAF50, 0))
+fill(plot(upper_band), plot(lower_band), color.new(#673AB7, 90), "Band Area")
+
+// Plot trading levels
+plot(strategy.position_size > 0 ? stop_loss_level : na, "Stop Loss", color=color.red, style=plot.style_linebr)
+plot(strategy.position_size > 0 ? take_profit_level : na, "Take Profit", color=color.green, style=plot.style_linebr)