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

@@ -1,10 +1,29 @@
 [![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
-magnet_url-rs 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.
+# What is a magnet url
+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.
 
 ## How to use this crate
 Parsing a magnet is very simple:

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)";
 
-
-///# Intro
+///# What is a magnet url
+///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