added prompt function

src/utils.rs

@@ -1,7 +1,21 @@
 use crate::structs::{Library, Shelf};
-use std::{fs, io, path::Path};
+use std::{
+    fs,
+    io::{self, Write},
+    path::Path,
+};
 use xdg::BaseDirectories;
 
+pub fn prompt(text: &str) -> Result<String, std::io::Error> {
+    print!("{} ", text);
+    std::io::stdout().flush()?;
+
+    let mut response = String::new();
+    std::io::stdin().read_line(&mut response);
+
+    Ok(response.trim_end().to_owned())
+}
+
 pub fn get_shelf_index(shelves: &Vec<Shelf>, id: &u8) -> Option<usize> {
     shelves.iter().position(|shelf| shelf.id == *id)
 }