added some documentation

src/parser.rs

@@ -1,5 +1,7 @@
 use regex::Regex;
 
+/// Parses the output of PM3 finds the read IDs
+/// Example input: `[+] UID.... 3112B710`
 pub fn parse_line(line: &str) -> Option<String> {
     let regex = Regex::new(r"(?m)^\[\+\] UID.... (.*)$").unwrap();
     let result = regex.captures(line);