support chaining style code

[Newp]

as-is

var crc = CrcAlgorithm.CreateCrc16CcittFalse();

// Give it some bytes to chew on - you can call this multiple times if needed
crc.Append(Encoding.ASCII.GetBytes("Hurray for cake!"));

// Get the output - as a hex string, byte array or unsigned integer
Console.WriteLine(crc.ToHexString());

to-be

var crc = CrcAlgorithm
.CreateCrc16CcittFalse()
.Append(Encoding.ASCII.GetBytes("Hurray for cake!"));

Console.WriteLine(crc.ToHexString());

[DATEx2]

This would be useful, explicitly in my use-case to be doing CRC of multiple files and get a single unique number