Document build system based on GNU Make
$ mkdir your-project
$ cd your-project
$ git clone https://github.com/yasuo-ozu/docsys.git .docsys
$ make -C .docsys install
$ cd your-project
$ git submodule add https://github.com/yasuo-ozu/docsys.git .docsys
$ make -C .docsys install
$ cp -r .docsys/sample/simple/* .