Minor documentation improvements

I got some feedback from Redditors, and addd some information as to what
a magnet url is, and why a magnet-url parser is useful

README.md

@@ -1,7 +1,26 @@
 [![Build Status](https://www.travis-ci.com/billyb2/parse-magnet-rs.svg?branch=main)](https://www.travis-ci.com/billyb2/parse-magnet-rs)
 # The Rust Magnet URL Parser!
-# Intro
+# What is a magnet url
-magnet_url-rs has the goal of, as you may have guessed, parsing the parts of magnets. It does
+A magnet is a URI scheme that identifies files by their hash, 
+ normally used in peer to peer file sharing networks (like 
+ Bittorrent). Basically, a magnet link identifies a torrent you 
+ want to download, and tells the torrent client how to download 
+ it. They make it very easy to share files over the internet, 
+ and use a combination of DHT and trackers to tell your torrent 
+ client where other peers who can share the file with you are.
+
+# Why is magnet_url
+While working on a side project, I realized that I had the 
+ misfortune of trying to get the component parts of a magnet-url 
+ and then do further processing of them. I quickly wrote some 
+ Regex for it, but then I realized that this would be really 
+ useful for other projects that are dealing with torrents in 
+ Rust. By making it modifiable, too, it would allow for the 
+ creation of custom magnet links, which would also be useful for
+ torrent based projects.
+
+# Why use magnet_url
+ magnet_url has the goal of, as you may have guessed, parsing the parts of magnets. It does
  this using some relatively simple regexes. The crate is designed to be very simple and efficient,
  with a lot of flexibility. It's also designed to be relatively easy to handle errors, and
  modification of it's source is greatly encouraged through documentation and it's license.

src/lib.rs

@@ -14,8 +14,26 @@ const WEB_SEED_RE_STR: &str = r"ws=([A-Za-z0-9!@#$%^:*<>,?/()_+=.{}\{}\-]*)(&|$|
 const ACCEPTABLE_SOURCE_RE_STR: &str = r"as=((\w+)[A-Za-z0-9!@#$%^:*<>,?/()_+=.{}\\-]*)(&|$|\s)";
 const MANIFEST_TOPIC_RE_STR: &str = r"mt=((\w+)[A-Za-z0-9!@#$%^:*<>,?/()_+=.{}\\-]*|urn:(sha1|btih|ed2k|aich|kzhash|md5|tree:tiger):([A-Fa-f0-9]+|[A-Za-z2-7]+))(&|$|\s)";
 
-
+///# What is a magnet url
-///# Intro
+///A magnet is a URI scheme that identifies files by their hash, 
+/// normally used in peer to peer file sharing networks (like 
+/// Bittorrent). Basically, a magnet link identifies a torrent you 
+/// want to download, and tells the torrent client how to download 
+/// it. They make it very easy to share files over the internet, 
+/// and use a combination of DHT and trackers to tell your torrent 
+/// client where other peers who can share the file with you are.
+///
+///# Why is magnet_url
+///While working on a side project, I realized that I had the 
+/// misfortune of trying to get the component parts of a magnet-url 
+/// and then do further processing of them. I quickly wrote some 
+/// Regex for it, but then I realized that this would be really 
+/// useful for other projects that are dealing with torrents in 
+/// Rust. By making it modifiable, too, it would allow for the 
+/// creation of custom magnet links, which would also be useful for
+/// torrent based projects.
+///
+///# Why use magnet_url
 /// magnet_url has the goal of, as you may have guessed, parsing the parts of magnets. It does
 /// this using some relatively simple regexes. The crate is designed to be very simple and efficient,
 /// with a lot of flexibility. It's also designed to be relatively easy to handle errors, and