add authors to Cargo.toml

this is required by [C-METADATA].

[C-METADATA]: https://rust-lang.github.io/api-guidelines/documentation.html#c-metadata

Author: rursprung

Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/rust-embedded-community/tb6612fng-rs"
 categories = ["embedded", "hardware-support", "no-std", "no-std::no-alloc"]
 keywords = ["tb6612fng", "driver", "motor", "controller", "embedded-hal-driver"]
 license = "MIT OR Apache-2.0"
+authors = ["Ralph Ursprung <[email protected]>", "ripytide <[email protected]>"]
 
 [features]
 defmt-03 = ["dep:defmt"]