There is a config.sample.toml provided in the repo for the sample configuration.
[proxy]
# Can be either "tcp" or "tls"
type = "tcp"
source = "127.0.0.1:4500"
destination = "127.0.0.1:5500"
# Only required in case of tls
cert = "/path/to/cert"
key = "/path/to/certkey"