Implement init command

src/commands.rs

@@ -0,0 +1,18 @@
+mod init;
+
+use clap::Parser;
+
+use crate::Environment;
+
+#[derive(Debug, Parser)]
+pub enum Command {
+    Init(init::Command),
+}
+
+impl Command {
+    pub fn run(self, env: &Environment) -> anyhow::Result<()> {
+        match self {
+            Self::Init(command) => command.run(env),
+        }
+    }
+}