add time, ratio functionalities

[uyw4687]

No description provided.

[nayuki]

Rejected for the following reasons:

• Timing and compression ratio are not functionalities I want in the program. You can achieve timing easily with the Unix time command.
• The .gitignore file doesn't reflect everybody's preferences. If you look at all my projects, I have almost zero gitignore files. This is not an accident; this is deliberate.
• The format of your imports doesn't follow my format.
• The change in the command-line arguments is not in improvement in my opinion. Stating the input and output files explicitly is clearer in this situation.
• We don't use the ancient % string formatting operator anymore. I use f-strings (Python 3.6+).
• Too many blank lines were added.
• Poorly formatted whitespace in code, such as: print("text text"% (t2-t1) ), which should be print("text text" % (t2 - t1))