feat: implemented service/transport/main layers

internal/service/deps.go

@@ -0,0 +1,16 @@
+package service
+
+import (
+	"context"
+	"time"
+)
+
+type Redis interface {
+	Lock(ctx context.Context, key string, ttl time.Duration) (func(context.Context), error)
+	Set(key string, value []byte, ttl time.Duration) error
+	Get(key string) ([]byte, error)
+}
+
+type Downloader interface {
+	Download(ctx context.Context)
+}