Set up a client and basic command infrastructure

src/commands/mod.rs

@@ -0,0 +1 @@
+pub mod server_version;

src/commands/server_version.rs

@@ -0,0 +1,9 @@
+use anyhow::Result;
+
+use crate::Client;
+
+pub async fn server_version(client: &Client) -> Result<()> {
+    let version = client.get_server_version().await?;
+    println!("{}.{}.{}", version.major, version.minor, version.patch);
+    Ok(())
+}