feat: add hello middleware (#1)

* feat: add hello middleware

* add changeset

.changeset/young-ligers-type.md

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+---
+'@honojs/hello': patch
+---
+
+the repository has been moved

packages/hello/README.md

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+# Hello middleware for Hono
+
+An example project of the third-party middleware for [Hono](https://github.com/honojs/hono).
+This middleware add `X-Message` header to the Response.
+
+## Usage
+
+```ts
+import { hello } from '@honojs/hello'
+import { Hono } from 'hono'
+
+const app = new Hono()
+
+app.use('*', hello('Hello!! Hono!!'))
+app.get('/', (c) => c.text('foo'))
+
+export default app
+```
+
+## Author
+
+Yusuke Wada <https://github.com/yusukebe>
+
+## License
+
+MIT

packages/hello/jest.config.js

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+module.exports = require('../../jest.config.js')

packages/hello/package.json

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+{
+  "name": "@honojs/hello",
+  "version": "0.0.6",
+  "description": "An example of third-party middleware for Hono",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "test": "jest",
+    "build": "rimraf dist && tsc",
+    "prerelease": "yarn build && yarn test",
+    "release": "yarn publish"
+  },
+  "license": "MIT",
+  "private": false,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/honojs/middleware.git"
+  },
+  "homepage": "https://github.com/honojs/middleware",
+  "dependencies": {
+    "hono": "^2.2.5"
+  }
+}

packages/hello/src/index.test.ts

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+import { Hono } from 'hono'
+import { hello } from '../src'
+
+describe('Hello middleware', () => {
+  const app = new Hono()
+
+  app.use('/hello/*', hello())
+  app.get('/hello/foo', (c) => c.text('foo'))
+
+  app.use('/x/*', hello('X'))
+  app.get('/x/foo', (c) => c.text('foo'))
+
+  it('Should be hello message', async () => {
+    const res = await app.request('http://localhost/hello/foo')
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(200)
+    expect(res.headers.get('X-Message')).toBe('Hello')
+  })
+
+  it('Should be X', async () => {
+    const res = await app.request('http://localhost/x/foo')
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(200)
+    expect(res.headers.get('X-Message')).toBe('X')
+  })
+})

packages/hello/src/index.ts

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+import type { Handler } from 'hono'
+
+export const hello = (message: string = 'Hello'): Handler => {
+  return async (c, next) => {
+    await next()
+    c.res.headers.append('X-Message', message)
+  }
+}

packages/hello/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "./src",
+    "outDir": "./dist",
+  },
+  "include": [
+    "src/**/*.ts"
+  ],
+}