feat(example): add signedURL example

examples/s3-sign/.gitignore

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+node_modules
+.env

examples/s3-sign/README.md

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+```
+npm install
+npm run start
+```
+
+```
+open http://localhost:3000
+```

examples/s3-sign/package.json

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+{
+  "name": "@hono-storage/s3-sign-example",
+  "private": true,
+  "version": "0.0.0",
+  "scripts": {
+    "start": "tsx src/index.ts"
+  },
+  "dependencies": {
+    "@aws-sdk/client-s3": "^3.428.0",
+    "@hono-storage/s3": "workspace:*",
+    "@hono/node-server": "^1.1.0",
+    "dotenv": "^16.3.1",
+    "hono": "^3.8.1"
+  },
+  "devDependencies": {
+    "tsx": "^3.12.2"
+  }
+}

examples/s3-sign/src/index.ts

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+import { S3Client } from "@aws-sdk/client-s3";
+import { serve } from "@hono/node-server";
+import { HonoS3Storage } from "@hono-storage/s3";
+import { config } from "dotenv";
+import { Hono } from "hono";
+import { html } from "hono/html";
+
+config();
+
+const app = new Hono();
+
+if (!process.env.AWS_ACCESS_KEY_ID || !process.env.AWS_SECRET_ACCESS_KEY) {
+  throw new Error("AWS credentials not found");
+}
+
+const client = new S3Client({
+  region: "us-east-1",
+  credentials: {
+    accessKeyId: process.env.AWS_ACCESS_KEY_ID,
+    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
+  },
+});
+
+const storage = new HonoS3Storage({
+  key: (_, file) =>
+    `${file.originalname}-${new Date().getTime()}.${file.extension}`,
+  bucket: "hono-storage",
+  client,
+});
+
+let signedURL = "";
+
+app.post(
+  "/",
+  storage.single("image", {
+    sign: {
+      expiresIn: 60,
+    },
+  }),
+  (c) => {
+    signedURL = c.var.signedURLs.image || "";
+    return c.html(html`
+      <a href="/">Back</a>
+      <p>Image uploaded successfully</p>
+      <code>${signedURL}</code>
+    `);
+  },
+);
+
+app.get("/", (c) =>
+  c.html(html`
+    <form action="/" method="POST" enctype="multipart/form-data">
+      <input type="file" name="image" />
+      <button type="submit">Submit</button>
+    </form>
+    <img src="${signedURL}" />
+  `),
+);
+
+serve(app);