Add documentation on how to send logs to Parseable from a Rust application

[nitisht]

Parseable website has docs on how to directly send logs from Go, Python, Java, JS etc. Ref: https://www.parseable.io/docs/log-ingestion/applications/go

We need to add docs on how to directly sends logs from a Rust application.

Please send the PR to parseablehq/parseable repo and we'll add it to the website.