update cargo.toml fields

Cargo.toml

@@ -3,8 +3,10 @@ name = "ham-cats"
 version = "0.1.0"
 edition = "2021"
 license = "MIT"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+description = "Reference implementations for CATS, the ham radio protocol"
+repository = "https://gitlab.scd31.com/cats/ham_cats"
+homepage = "https://cats.radio"
+categories = ["embedded", "encoding", "no-std", "no-std::no-alloc"]
 
 [dependencies]
 arrayvec = { version = "0.7.4", default-features = false }