rebar3/priv/templates/app.template

{description, "OTP Application"}.
{variables, [
    {name, "mylib", "Name of the OTP application"},
    {desc, "An OTP application", "Short description of the app"}
]}.
{template, "app.erl.dtl", "src/{{name}}_app.erl"}.
{template, "otp_app.app.src.dtl", "src/{{name}}.app.src"}.
{template, "rebar.config.dtl", "rebar.config"}.
{template, "gitignore.dtl", ".gitignore"}.
{template, "LICENSE.dtl", "LICENSE"}.
{template, "README.md.dtl", "README.md"}.