add sendgrid example

nodemailer/README.md

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+```
+docker compose up -d
+# http://localhost:8025 にアクセスして確認
+pnpm i
+node index.mjs
+```

nodemailer/compose.yml

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+services:
+  # maildev:
+  #   image: maildev/maildev
+  #   ports:
+  #     - "1080:1080" # Web UI
+  #     - "1025:1025"
+  #   environment:
+  #     MAILDEV_INCOMING_USER: postmaster
+  #     MAILDEV_INCOMING_PASS: password
+  mailpit:
+    image: axllent/mailpit
+    ports:
+      - "8025:8025" # Web UI
+      - "1025:1025"
+    environment:
+      MP_SMTP_AUTH_FILE: /etc/mailpit/auth
+      MP_SMTP_AUTH_ALLOW_INSECURE: "true"
+    volumes:
+      - ./etc/mailpit:/etc/mailpit:ro

nodemailer/etc/mailpit/auth

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+postmaster:password

nodemailer/index.mjs

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+import nodemailer from "nodemailer";
+
+const transporter = nodemailer.createTransport({
+  host: "localhost",
+  port: 1025,
+  secure: false,
+  auth: {
+    user: "postmaster",
+    pass: "password",
+  },
+});
+
+const info = await transporter.sendMail({
+  from: "foo <foo@example.com>",
+  to: "bar <bar@example.com>",
+  subject: "Hello world!",
+  html: "<marquee>Hello world.</marquee>",
+});
+
+console.log(info.messageId);

nodemailer/package.json

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+{
+  "name": "nodemailer",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Kohei Watanabe <kou029w@gmail.com>",
+  "license": "MIT",
+  "devDependencies": {
+    "nodemailer": "^6.9.4"
+  }
+}

nodemailer/pnpm-lock.yaml

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+lockfileVersion: '6.0'
+
+devDependencies:
+  nodemailer:
+    specifier: ^6.9.4
+    version: 6.9.4
+
+packages:
+
+  /nodemailer@6.9.4:
+    resolution: {integrity: sha512-CXjQvrQZV4+6X5wP6ZIgdehJamI63MFoYFGGPtHudWym9qaEHDNdPzaj5bfMCvxG1vhAileSWW90q7nL0N36mA==}
+    engines: {node: '>=6.0.0'}
+    dev: true

nodemailer/sendgrid.mjs

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+import nodemailer from "nodemailer";
+
+// see https://support.sendgrid.kke.co.jp/hc/ja/articles/204187885-SMTP%E3%81%AE%E6%8E%A5%E7%B6%9A%E6%83%85%E5%A0%B1%E3%82%92%E6%95%99%E3%81%88%E3%81%A6%E3%81%8F%E3%81%A0%E3%81%95%E3%81%84-
+const transporter = nodemailer.createTransport({
+  host: "smtp.sendgrid.net",
+  port: 465,
+  secure: true,
+  auth: {
+    user: "apikey",
+    pass: "SG.****", // https://app.sendgrid.com/settings/api_keys > Create API Key > Mail Send > Custom Access > Mail Send
+  },
+});
+
+const info = await transporter.sendMail({
+  from: "foo@example.org",
+  to: "bar@example.org",
+  subject: "Hello world!",
+  html: "<marquee>Hello world.</marquee>",
+});
+
+console.log(info.messageId);