init; project structure & bybit provider

internal/provider/provider.go

@@ -0,0 +1,12 @@
+package provider
+
+import (
+	"context"
+	"crypto_alert_bot/internal/entities"
+)
+
+type Provider interface {
+	// Price returns the current price of the pair (base currency / quote currency).
+	// e.g. BTC/USDT.
+	Price(ctx context.Context, pair entities.Pair) (*entities.Price, error)
+}