docs: Add README

README.md

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+# @n8n/tournament
+
+Tournament is an output-compatible rewrite of [`riot-tmpl`](https://github.com/riot/tmpl) for template expression evaluation.
+
+## Installation
+
+```sh
+pnpm add @n8n/tournament
+```
+
+## Features
+
+- Compatible with `riot-tmpl` expressions
+- ES6 syntax support, e.g. arrow functions and template literals
+- Built-in AST hooks for expression manipulation
+- TypeScript support
+
+## Usage
+
+```ts
+import { Tournament } from '@n8n/tournament';
+
+const tournament = new Tournament();
+
+// simple expressions
+tournament.execute('{{ 1 + 2 }}', {}); // 3
+
+// with data context
+tournament.execute('{{ user.name }}', { user: { name: 'John' } }); // 'John'
+
+// template strings
+tournament.execute('{{ `Hello ${user.name}!` }}', { user: { name: 'John' } }); // 'Hello John!'
+
+// error handling
+const tournament = new Tournament((error) => {
+	console.error('Expression error:', error);
+});
+```
+
+## Release
+
+To release, update the version in `package.json` and run:
+
+```sh
+npm version {version}
+npm publish
+```
+
+You will need permissions to publish via n8n's npm org.