chore: add a skelton project for tRPC Adapter (#8)

packages/trpc-adapter/README.md

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+# tRPC Adapter Middleware for Hono
+
+## Usage
+
+```ts
+
+```
+
+## Author
+
+## License
+
+MIT

packages/trpc-adapter/jest.config.js

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

packages/trpc-adapter/package.json

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+{
+  "name": "@honojs/trpc-adapter",
+  "version": "0.0.0",
+  "description": "tRPC Adapter 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,
+  "publishConfig": {
+    "registry": "https://registry.npmjs.org",
+    "access": "public"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/honojs/middleware.git"
+  },
+  "homepage": "https://honojs.dev",
+  "dependencies": {
+    "hono": "^2.2.5"
+  }
+}

packages/trpc-adapter/src/index.test.ts

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+import { Hono } from 'hono'
+import { trpcAdapter } from '../src'
+
+describe('tRPC Adapter Middleware', () => {
+  const app = new Hono()
+
+  app.use('/trpc/*', trpcAdapter())
+  app.get('/trpc', (c) => c.text('Here is dummy endpoint'))
+
+  it('Should return 200 response', async () => {
+    const res = await app.request('http://localhost/trpc')
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(200)
+  })
+})

packages/trpc-adapter/src/index.ts

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+import type { Handler } from 'hono'
+
+export const trpcAdapter = (): Handler => {
+  return async (_c, next) => {
+    await next()
+  }
+}

packages/trpc-adapter/tsconfig.json

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