add metadata for toml

Author: wjwei-handsome

Cargo.toml

@@ -2,6 +2,9 @@
 name = "rsnow"
 version = "0.1.0"
 edition = "2021"
+description = "A simple snowfall animation in Rust"
+authors = ["Wenjie Wei <[email protected]>"]
+license = "MIT"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html