All: Use Lerna to manage monorepo

packages/app-cli/app/command-exit.js

@@ -0,0 +1,23 @@
+const { BaseCommand } = require('./base-command.js');
+const { app } = require('./app.js');
+const { _ } = require('@joplinapp/lib/locale');
+
+class Command extends BaseCommand {
+	usage() {
+		return 'exit';
+	}
+
+	description() {
+		return _('Exits the application.');
+	}
+
+	compatibleUis() {
+		return ['gui'];
+	}
+
+	async action() {
+		await app().exit();
+	}
+}
+
+module.exports = Command;