Added documentation

README.MD

@@ -0,0 +1,43 @@
+# Hosts Updater
+
+A simple command line tool for updating your hosts file. This software can compress large hosts files.
+
+```commandline
+A piece of software for updating hosts files
+
+Usage: update_hosts2.exe [OPTIONS] --urls <urls>...
+
+Options:
+  -u, --urls <urls>...                   A list of files to download
+  -o, --out <out>                        Where to write the file to [default: hosts]
+  -c, --compression_level <compression>  The number of columns to use [default: 9]
+  -i, --ignore [<ignore>...]             Select urls/files to use as an ignore list
+  -h, --help                             Print help information
+  -V, --version                          Print version information
+```
+
+## Examples
+
+Let's say you want to update to add an ignore filter to your current hosts file:
+
+```commandline
+> update_hosts2 --urls file:///etc/hosts --out /etc/hosts --ignore file://hosts
+```
+
+Let's say you want to merge your current hosts file with [Steven Black's Hosts](https://github.com/StevenBlack/hosts)
+
+```commandline
+> update_hosts2 --urls https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts file:///etc/hosts --out /etc/hosts
+```
+
+Let's say you wanted to only block gambling websites using Steven Black's Hosts:
+
+```commandline
+> update_hosts2 --urls https://raw.githubusercontent.com/StevenBlack/hosts/master/alternates/gambling/hosts file:///etc/hosts --out /etc/hosts --ignore https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts
+```
+
+Let's say you wanted to use Steven Black's Hosts on Windows (Level 9 Compression required for performance):
+
+```commandline
+> update_hosts2 --urls https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts --out C:\Windows\System32\drivers\etc\hosts -c 9
+```

src/main.rs

@@ -98,7 +98,7 @@ pub fn main() -> Result<(), ()> {
         if let Some(x) = ign {
             x.map(|v| v.to_owned()).collect()
         } else {
-            vec![]
+            Vec::new()
         }
     };