ADD: added first version

internal/model/trade.go

@@ -0,0 +1,14 @@
+package model
+
+import "time"
+
+type Trade struct {
+	Time       time.Time
+	Symbol     string
+	Side       string
+	Price      float64
+	Qty        int
+	Cash       float64
+	StopPrice  float64 // ATR-based stop
+	TakeProfit float64 // ATR-based take profit
+}