Add FastAPI todobackend.com app example.

Author: dom96

fastapi-todo/README.md

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+# FastAPI Todo Backend
+
+A Python FastAPI implementation of the [Todo-Backend](https://todobackend.com) spec, running on Cloudflare Workers with D1 for storage.
+
+## Development
+
+Initialize the local D1 database and start the dev server:
+
+```sh
+uv run pywrangler d1 execute todos --local --file db_init.sql
+uv run pywrangler dev
+```
+
+## Testing with the Todo-Backend spec runner
+
+Start the dev server, then open the spec runner pointing at your local instance:
+
+```
+https://todobackend.com/specs/index.html?http://localhost:8787/todos
+```
+
+You can also use the Todo-Backend client app:
+
+```
+https://todobackend.com/client/index.html?http://localhost:8787/todos
+```
+
+## API
+
+| Method   | Path             | Description        |
+| -------- | ---------------- | ------------------ |
+| `GET`    | `/todos`         | List all todos     |
+| `POST`   | `/todos`         | Create a todo      |
+| `DELETE`  | `/todos`         | Delete all todos   |
+| `GET`    | `/todos/{id}`    | Get a single todo  |
+| `PATCH`  | `/todos/{id}`    | Update a todo      |
+| `DELETE`  | `/todos/{id}`    | Delete a todo      |

fastapi-todo/db_init.sql

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+CREATE TABLE IF NOT EXISTS todos (
+    id TEXT PRIMARY KEY,
+    title TEXT NOT NULL DEFAULT '',
+    completed INTEGER NOT NULL DEFAULT 0,
+    "order" INTEGER
+);