panic review

subjects/panic/README.md

@@ -2,20 +2,28 @@
 
 ### Instructions
 
-Write a function that tries to open a file and panics if the file
+Write a **function** that tries to open a file and panics if the file
-doesn't exist
+does not exist.
+
+### Notions
 
 ### Expected Function
 
 ```rust
-pub fn open_file(s: &str) -> File {}
+pub fn open_file(s: &str) -> File {
+
+}
 ```
 
 ### Usage
 
-Here is a program to test your function
+Here is a program to test your function:
 
 ```rust
+use std::fs::File;
+use std::fs;
+use panic::*;
+
 fn main() {
     let filename = "created.txt";
     File::create(filename).unwrap();