added comments

backend/internal/posts/resource.go

@@ -2,10 +2,12 @@ package posts
 
 import "gorm.io/gorm"
 
+// Service Represents a service with a database connection.
 type Service struct {
 	db *gorm.DB
 }
 
+// Service New creates a new Service instance, initializing it with a GORM database connection.
 func New(db *gorm.DB) *Service {
 	return &Service{db: db}
 }