add sample generator code

Author: seiya0914

generator/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "generator",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "devDependencies": {
+    "plop": "4.0.1"
+  }
+}

generator/sample.js

@@ -0,0 +1,16 @@
+const args = process.argv.slice(2);
+import { Plop, run } from "plop/src/plop.js";
+import minimist from "minimist";
+const argv = minimist(args);
+
+Plop.prepare(
+  {
+    cwd: argv.cwd,
+    preload: argv.preload || [],
+    configPath: argv.plopfile,
+    completion: argv.completion,
+  },
+  function (env) {
+    Plop.execute(env, run);
+  },
+);