Convert README to Markdown

[chrisfinazzo]

Is there a reason you chose "Software Package Notes"? My apologies in advance, I'm not well-versed with Python or Debian to know whether or not this is standard practice. If the idea is appealing, I will submit a PR for this and #16.

[ccontavalli]

Today, I generate the README by using the command "pydoc ./ssh-ident", this extracts the comments from the .py file, and generates the man page and README.

There was at least another issue raised a month or two ago mentioning that the documentation could be clearer and better formatted. So I'm all for it :) if you have time, that'd be great.

Sorry it took me a while to get back to you. Thanks!

[kominoshja]

Just came across this after submitting #64 :)

[chrisfinazzo]

@kominoshja This was on my list for a long time, I guess it just fell off the radar. Thanks for picking it up.