Added description to input and output parameters, and created a demo to give an example of the functionalities.

Added a method to zip a list of files:

This method takes a list of files (RLFileRecordList ssListOfFiles) and compresses them into a tar file. It returns the compressed file as an array of bytes (byte[] ssCompressedFile) and a string (string ssProcess) indicating the process. 

It creates a MemoryStream to hold the tar file, then creates a GZipStream to compress it. It then creates a TarOutputStream using the GZipStream, and for each file in the list of files, it creates an entry for it in the tar stream, writing its content as bytes to the stream. Finally, it copies the GZipStream to a MemoryStream and returns that as an array of bytes.