sMark is a simple markup language built for humans, it is easy to read and write, you can get an introduction here
If you already have Golang installed you can get it throught go get (go get https://github.com/gSpera/sMark)
Otherwise you can downloa9d the prebuilt binary from Github
Use sMark - help to get a brief intruduction to all command parameters
Basicaly you could use sMark -i inputfile.sm -o output.html
The main output engine produces HTML but there are other output engines and you can make you own
Telegra.ph: sMark -i inputfile.sm -telegraph Prettifier: sMark -i inputfile.sm -prettify = output.sm
sMark is in a developing state, some functions are now documented and the code is not optimal
The file you are viewing is a Markdown version of the file README.sm, there is no easy way to convert sMark to Markdown(you can write you own Output Engine), it is actualy compiled to HTML and then converted to Markdown This solution is not optimal but GitHub doesn't support sMark