init: add source code from src.zip

src/commands/help/index.ts

@@ -0,0 +1,10 @@
+import type { Command } from '../../commands.js'
+
+const help = {
+  type: 'local-jsx',
+  name: 'help',
+  description: 'Show help and available commands',
+  load: () => import('./help.js'),
+} satisfies Command
+
+export default help