Create a message queue

The create command creates a new message queue with support of the
typical parameters `mode`, `capacity` and `msgsize`. This command also
supports the global argument `verbose`.

src/main.rs

@@ -1,9 +1,17 @@
+use anyhow::Result;
 use clap::Clap;
 
 mod cli;
+mod create;
 
-use cli::Opts;
+use cli::{Command, Opts};
 
-fn main() {
-    Opts::parse();
+fn main() -> Result<()> {
+    let opts: Opts = Opts::parse();
+
+    match opts.command {
+        Command::Create(c) => c.run(opts.verbose)?,
+    }
+
+    Ok(())
 }