rebar3/priv/templates/readme.template

{variables, [{appid, "myapp"}
            ,{copyright_year, "2014"}
            ,{copyright_holder, "Geoff Cant"}
            ,{author_name, "Geoff Cant"}
            ,{author_email, "nem@erlang.geek.nz"}
            ]}.
{template, "Readme.md", "Readme.md"}.