Cargo.toml: add description

Author: marcoieni

Cargo.toml

@@ -1,11 +1,13 @@
 [package]
 name = "rust-gh-example"
-version = "0.1.0"
+version = "0.1.3"
 authors = ["MarcoIeni <[email protected]>"]
 edition = "2018"
+description = "Example of Rust GitHub template"
 repository = "https://github.com/rust-github/rust-gh-example"
 license = "MIT OR Apache-2.0"
 readme = "README.md"
+homepage = "https://rust-github.github.io/"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html