echo example for s2n-quic library

Generate cert and key

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes -subj "/CN=localhost"

Move pem(s) to certs directory

mkdir certs
mv *.pem certs/

run echo server

cargo run -- server

run echo client

cargo run -- client