Please add website manual and include it here as markdown file

[eabase]

Please update website to SSL as link to site is not working.
Alternatively create a markdown file of the same here. Better!

http://kmkeen.com/rtl-demod-guide/index.html # Unreachable link!

https://web.archive.org/web/20231123141502/http://kmkeen.com/rtl-demod-guide/index.html

[eabase]

I made it into an md file here:
https://gist.github.com/eabase/b79cc26f82958f18e95b62d8aadaa452