Flesh out README.md a bit

README.md

@@ -12,4 +12,32 @@ version.
 Install and run
 ===============
 Sausagewiki aims to be simple to get up and running. It is distributed as a
-single executable.
+single independent executable for Linux.
+
+ 1. Download the latest build of `sausagewiki.xz` from <https://github.com/maghoff/sausagewiki/releases/latest>
+ 2. Decompress: `xz -d sausagewiki.xz`
+ 3. Set execution permission: `chmod a+x sausagewiki`
+ 4. Run: `./sausagewiki wiki.db`
+
+For other platforms you will presently have to build it yourself. Sausagewiki
+is built like other Rust projects, with `cargo build`.
+
+Command line arguments
+----------------------
+    USAGE:
+        sausagewiki [OPTIONS] <DATABASE>
+
+    FLAGS:
+        -h, --help       Prints help information
+        -V, --version    Prints version information
+
+    OPTIONS:
+        -p, --port <port>    Sets the listening port
+
+    ARGS:
+        <DATABASE>    Sets the database file to use
+
+Sausage will create an SQLite database file with the filename given in the
+`DATABASE` parameter and open an HTTP server bound to `127.0.0.1` and the given
+port number. The default port number is 8080.
+