readme: prepare for crate submission

Author: Ballasi

Cargo.toml

@@ -1,7 +1,14 @@
 [package]
 name = "num2words"
 version = "0.1.0"
+authors = ["Asperatus <rust@ballasi.com>"]
 edition = "2018"
+description = "Convert numbers like 42 to forty-two"
+license = "MIT OR Apache-2.0"
+documentation = "https://docs.rs/num2words"
+repository = "https://github.com/Ballasi/num2words/"
+keywords = ["numbers", "words"]
+readme = "README.md"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

README.md

@@ -1,5 +1,7 @@
 # num2words
 
+<a href="https://crates.io/crates/num2words"><img src="https://img.shields.io/crates/v/num2words"/></a> <a href="https://crates.io/crates/num2words"><img src="https://img.shields.io/crates/d/num2words"/></a> <a href="https://docs.rs/num2words"><img src="https://img.shields.io/docsrs/num2words"/></a> <a href="#license"><img src="https://img.shields.io/crates/l/num2words"/></a>
+
 Convert number like `42` to `forty-two`
 
 Example usage:
@@ -8,7 +10,26 @@ use num2words::num2words;
 assert_eq!(num2words!(42), Ok(String::from("forty-two")));
 ```
 
-This lib will also be a downloadable binary in the near future.
+The app can also be run via a command-line interface.
+
+Example:
+```sh
+$ num2words 42
+forty-two
+$ num2words 10 --to EUR
+ten euros
+```
+
+You can download the app via the following command:
+```sh
+$ cargo install num2words
+```
+
+For more information about the usage of `num2words` please refers to the
+docs or via the following command:
+```sh
+$ num2words --help
+```
 
 This library is widely inspired by [Savoir-faire Linux's Python
 lib](https://github.com/savoirfairelinux/num2words/).