Feat: Add cli struct.

src/main.rs

@@ -1,3 +1,8 @@
+struct Cli {
+    pattern: String,
+    path: std::path::PathBuf,
+}
+
 fn main() {
     let pattern = std::env::args().nth(1).expect("no pattern given.");
     let path = std::env::args().nth(2).expect("no path given.");