cleanup: move test files to their own directory

.gitignore

@@ -1 +1,2 @@
 /target
+/testfiles

meow.dec.text

@@ -1 +0,0 @@
-cats would rule the world better than humans

meow.enc

@@ -1 +0,0 @@
- ł¶Îí޶ńNzN˙®<CB99>Ŕ˙=)|ŕچÔ'ÝVéđP‚ŔNŚz…†Rć´˝‚

meow.txt

@@ -1 +0,0 @@
-cats would rule the world better than humans

src/main.rs

@@ -3,6 +3,6 @@ use crypto::{encrypt_file, decrypt_file};
 
 fn main() {
     println!("Hello, world!");
-    encrypt_file("meow.txt", "meow.enc").unwrap();
-    decrypt_file("meow.enc", "meow.dec.text").unwrap();
+    encrypt_file("testfiles/meow.txt", "testfiles/meow.enc").unwrap();
+    decrypt_file("testfiles/meow.enc", "testfiles/meow.dec.text").unwrap();
 }