add Fees and Taxes to the Record type

internal/report.go

@@ -0,0 +1,15 @@
+package internal
+
+import (
+	"errors"
+)
+
+type RecordReader interface {
+	// ReadRecord should return Records until an error is found.
+	ReadRecord() (Record, error)
+}
+
+type ReportWriter interface {
+	// ReportWriter writes report items
+	Write(ReportItem) error
+}