Update README. Code refactoring.

downstream analysis tools such as [MAESTRO][MAESTRO], [ArchR][ArchR], [signac][signac]

and etc.

For the output, Chromap provide the function to translate input cell barcode to another barcode space. 

User can specify the translation file through the option **--barcode-translate**. 

The translation file is a two-column tsv/csv file with the original barcode on the second column and the translated barcode on the first column. This is useful for the case of 10x multiome data, where scATAC-seq and scRNA-seq data uses different sets of barcodes. 

This option also supports combinatorial barcoding, such as SHARE-seq. Chromap translates each barcode segment provided in the second column to the ID of the first column and added "-" to concatenate the IDs in the output.

#### <a name="map-hic"></a>Map Hi-C short reads

```sh

#ifndef BARCODETRANSLATOR_H_

#define BARCODETRANSLATOR_H_

#include <cinttypes>

#include <cstring>

#include <functional>

  }

};

}

#endif

#include <cinttypes>

#include <cstring>

#include <functional>

#include <fstream>

#include <iostream>

#include <string>

#include <vector>

#include "pairs_mapping.h"

#include "sam_mapping.h"

#include "sequence_batch.h"

#include "khash.h"

#include "barcode_translator.h"

namespace chromap {