take file path as arg

.gitignore

@@ -1 +1,3 @@
 /target
+
+test/

src/decompiler/main.rs

@@ -1,10 +1,12 @@
-use std::fs;
+use std::{env, fs};
 use core::slice::Iter;
 
 const REGISTERS: [&str; 8] = [ "B", "C", "D", "E", "H", "L", "M", "A" ];
 
 fn main() {
-    let file = fs::read("/home/lea/Downloads/invadeez/invadeez/rom/invaders.h").expect("where file");
+    let mut args = env::args();
+    let filename = args.nth(1).expect("Provide a path to a file to disassemble as an argument");
+    let file = fs::read(filename).expect("where file");
     let mut data = file.iter();
 
     while let Some(byte) = data.next() {