Add guides folder and weather-mcp guide (#1281)

### Description

Build an MCP Server with Weather tools using Express and Vercel

### Demo URL

To be used as reference for this guide:
https://vercel.com/guides/mcp-server-with-weather-tool-express?__vercel_draft=1

### Type of Change

- [x] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [x] 🛫 `npm run new-example` was used to create the example
- [ ] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [ ] 📱 Is it responsive? Are mobile and tablets considered?

Author: ismaelrumzan

guides/express-weather-mcp-server/.eslintrc.json

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+{
+  "root": true,
+  "extends": "next/core-web-vitals"
+}

guides/express-weather-mcp-server/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# Dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# Testing
+/coverage
+
+# Next.js
+/.next/
+/out/
+next-env.d.ts
+
+# Production
+build
+dist
+
+# Misc
+.DS_Store
+*.pem
+
+# Debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Local ENV files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Vercel
+.vercel
+
+# Turborepo
+.turbo
+
+# typescript
+*.tsbuildinfo

guides/express-weather-mcp-server/README.md

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+This example shows how to build an MCP Server with Weather tools using Express and Vercel
+
+## How to Use
+
+You can choose from one of the following two methods to use this repository:
+
+### One-Click Deploy
+
+Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=vercel-examples):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https://github.com/vercel/examples/tree/main/guides/express-weather-mcp-server&project-name=express-weather-mcp-server&repository-name=express-weather-mcp-server)
+
+### Clone and Deploy
+
+You can clone just this directory using:
+
+```bash
+npx degit vercel/examples/guides/express-weather-mcp-server express-weather-mcp-server
+cd express-weather-mcp-server
+```
+
+Run the Express app in development mode:
+
+First install the [Vercel CLI](https://vercel.com/docs/cli). You will need to link the code with a Vercel project.
+
+```bash
+vercel dev
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/new?utm_source=github&utm_medium=readme&utm_campaign=vercel-examples) ([Documentation](https://vercel.com/docs)).

guides/express-weather-mcp-server/package.json

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+{
+  "name": "express-weather-mcp-server",
+  "repository": "https://github.com/vercel/examples.git",
+  "license": "MIT",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "dev": "vc dev"
+  },
+  "dependencies": {
+    "express": "^5.1.0",
+    "mcp-handler": "^1.0.3",
+    "zod": "3.23.8"
+  },
+  "devDependencies": {
+    "@types/express": "^5.0.0",
+    "@types/node": "^20.0.0",
+    "tsx": "^4.7.0",
+    "typescript": "^5.0.0"
+  }
+}