Simplified Pushover Notification in Rust

Hi,

I recently started working with Pushover's API using Rust and wanted to share a simplified version of how to send notifications using the "reqwest" crate. While the current example in the documentation is comprehensive, I found that a more streamlined approach could benefit others who are new to both Rust and Pushover.

The example I developed aims to simplify the process of sending notifications with different priorities, including the addition of expire and retry parameters when the priority is set to 2 (Emergency).

You can find the full example here on GitHub

I believe this example could serve as an easier starting point for developers who want to quickly integrate Pushover into their Rust projects without diving into more complex structures.

Thank you for considering this!