init; project structure & bybit provider

internal/entities/price.go

@@ -0,0 +1,10 @@
+package entities
+
+import "github.com/shopspring/decimal"
+
+type Price struct {
+	Ask    decimal.Decimal // limit seller / market buyer. ask > bid.
+	Bid    decimal.Decimal // limit buyer / market seller. bid < ask.
+	Spread decimal.Decimal // delta between ask and bid.
+	Pair   Pair            // trading pair
+}