add comments

pkg/converters/camt/camt_data_reader.go

@@ -16,6 +16,7 @@ type camt053FileReader struct {
 }
 
 // read returns the imported camt.053 data
+// Reference: https://www.iso20022.org/message-set/1196/download
 func (r *camt053FileReader) read(ctx core.Context) (*camt053File, error) {
 	file := &camt053File{}
 

pkg/converters/ofx/ofx_data_reader.go

@@ -47,6 +47,7 @@ type ofxVersion2FileReader struct {
 }
 
 // read returns the imported open financial exchange (ofx) file
+// Reference: https://www.financialdataexchange.org/FDX/FDX/About/OFX-Work-Group.aspx?a315d1c24e44=2
 func (r *ofxVersion1FileReader) read(ctx core.Context) (*ofxFile, error) {
 	file := &ofxFile{}