Add installation section in README.md

Author: tmn

README.md

@@ -4,8 +4,16 @@ busterminal is a **BLAZINGLY FAST**, **RUST-BASED** CLI for.. jk. It's just a si
 
 ![busterminal example usage](https://s3.fr-par.scw.cloud/io.tmn.publicfiles/images/busterminal-5.png)
 
+## Installation
+
+Install **busterminal** using cargo:
+```bash
+$ cargo install busterminal
+```
+
 ## Usage
 
+Get departures from stops:
 ```bash
 $ busterminal --stop "Tyholt"
 ```