add description

Cargo.toml

@@ -6,6 +6,7 @@ repository = "https://gitlab.scd31.com/stephen/cargo-gg"
 license = "MIT"
 categories = ["command-line-utilities", "development-tools::cargo-plugins"]
 readme = "README.md"
+description = "Calls you a good girl when your cargo command succeeds (after it failed previously)"
 
 [dependencies]
 anyhow = "1.0.95"