Add startup_candle_count to sample strategy

user_data/strategies/sample_strategy.py

@@ -59,6 +59,9 @@ class SampleStrategy(IStrategy):
     sell_profit_only = False
     ignore_roi_if_buy_signal = False
 
+    # Number of candles the strategy requires before producing valid signals
+    startup_candle_count: int = 20
+
     # Optional order type mapping.
     order_types = {
         'buy': 'limit',