add js to test deno run
remove deno-test-util as dependency
Add Readme
Need Rust 1.65.
To compile only deno-test-util that don't exist on crate.io and is needed by deno at phase testing :
guix time-machine -C channels.scm -- build -f rust-deno-test-util-0-1-0.scm
To compile deno v1.25.2 !
guix time-machine -C channels.scm -- build -f rust-deno.scm