add code from middleware demo (#187)

Author: fredr

ts/middleware-demo/README.md

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+# Middleware Demo
+
+This is the code example used in the middleware demo [stream](https://www.youtube.com/watch?v=qInxenZVDJs). It demonstrates how to implement a simple authorization middleware that only allows users to update themselves while still being able to view other users in the system.
+
+All endpoints require authentication, pass the string `userid:1` in the authorization header to login as user with id 1. Replace 1 with any number.
+
+**Endpoints:**
+
+- `/users` (POST) - Create a new user
+- `/users` (GET) - List all users
+- `/users/:id` (GET) - Get user by id
+- `/users/:id` (PUT) - Update user by id
+- `/users/:id` (DELETE) - delete user by id
+
+
+## Developing locally
+
+### Prerequisite: Installing Encore
+
+If this is the first time you're using Encore, you first need to install the CLI that runs the local development
+environment. Use the appropriate command for your system:
+
+- **macOS:** `brew install encoredev/tap/encore`
+- **Linux:** `curl -L https://encore.dev/install.sh | bash`
+- **Windows:** `iwr https://encore.dev/install.ps1 | iex`
+
+When you have installed Encore, run:
+
+```bash
+encore app create --example=ts/middleware-demo
+```
+
+## Running locally
+
+Before running your application, make sure you have Docker installed and running. It's required to locally run Encore applications with databases.
+
+```bash
+encore run
+```
+
+Go to [http://localhost:4000](http://localhost:4000) in the browser to see the example frontend.
+
+You can also access Encore's [local developer dashboard](https://encore.dev/docs/observability/dev-dash) on <http://localhost:9400/> to view traces, API documentation, and more.
+
+## Deployment
+
+Deploy your application to a staging environment in Encore's free development cloud:
+
+```bash
+git add -A .
+git commit -m 'Commit message'
+git push encore
+```
+
+Then head over to the [Cloud Dashboard](https://app.encore.dev) to monitor your deployment and find your production URL.
+
+From there you can also connect your own AWS or GCP account to use for deployment.
+
+Now off you go into the clouds!
+
+## Testing
+
+```bash
+encore test
+```
+

ts/middleware-demo/encore.app

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+{
+	"id":   "",
+	"lang": "typescript"
+}