Start implementing "list"

imag-counter/src/list.rs

@@ -1,5 +1,10 @@
 use libimagrt::runtime::Runtime;
 
 pub fn list(rt: &Runtime) {
-    unimplemented!();
+    rt.cli()
+        .subcommand_matches("list")
+        .map(|scmd| {
+            debug!("Found 'list' subcommand...");
+
+        });
 }