Complete skeleton dispatcher

- Complete the dispatcher for the 'introducer' and 'local' command. This
  is currently only a skeleton.
- The 'introducer list' command is added.

src/commands/introducer.rs

@@ -0,0 +1,34 @@
+use anyhow::Result;
+
+use crate::cli::cli_args::{IntroducerCommand, IntroducerSubcommand};
+use crate::config::HuskConfigContainer;
+use crate::types::husk_context::HuskContext;
+use crate::crypto;
+
+pub mod add;
+pub mod remove;
+
+pub async fn dispatch(cmd: IntroducerCommand, config: HuskConfigContainer) -> Result<()> {
+    match cmd.subcommand {
+        IntroducerSubcommand::Add(add_cmd) => {
+            add::dispatch(add_cmd, &config).await?;
+        },
+        IntroducerSubcommand::Remove(rm_cmd) => {
+            remove::dispatch(rm_cmd, &config).await?;
+        },
+        IntroducerSubcommand::List => {
+            println!("list");
+            let context = HuskContext::new(&config.into())?;
+
+            for introducer in crypto::get_introducers(
+                &context.cert_store,
+                &context.policy,
+                context.local_trust_root.fingerprint()) {
+
+                println!("{}", introducer);
+            }
+        },
+    }
+
+    Ok(())
+}