To install the manpages move or copy the contents of the man directory into /usr/local/man (e.g. man/man1 -> /usr/local/man/man1.
Use for example
sudo cp -r man /usr/local/manWhen the manpages are installed you can simply call them with the man command
man jshWhen you want to view/read the manpages without installing them on your system, you have to call them with the man command while specifying their path.
man ./man/man1/jsh.1