Updated readme

readme.md

@@ -1,18 +1,17 @@
 #Example usage
 
-```extern crate quake3_loader;
+(Assuming that the pk3 file is unzipped locally)
+
+    extern crate quake3_loader;
     use std::fs::{File};
     use std::path::{Path};
     use std::io::{Read};
-
     fn main() {
         let path = Path::new("pak0/maps/q3dm1.bsp");
         let mut file = File::open(path).unwrap();
         let mut bytes = Vec::new();
         file.read_to_end(&mut bytes).unwrap();
-
         let bsp = quake3_loader::read_bsp(bytes);           
-           
         println!("{:?}", bsp);
     }
-```
+