docs: add README for Cucumber test framework

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+# Cucumber Gherkin-Style E2E Tests
+
+This directory contains Gherkin-style acceptance tests using Cucumber and Playwright for testing the EuchreCamp application.
+
+## Overview
+
+These tests follow the **Given-When-Then** syntax for behavior-driven development (BDD) and test the application from a user's perspective by interacting with the browser UI only.
+
+## Key Principles
+
+1. **Browser-only interactions**: Tests interact with the application via the browser (click, type, navigate)
+2. **No direct database access**: All data is created/modified through the UI
+3. **Dev site testing**: Tests run against a running development server
+4. **Happy path focus**: Tests verify common user workflows
+5. **Gherkin syntax**: Tests are written in plain English using Given-When-Then
+
+## Running Tests
+
+### Run all Cucumber tests
+```bash
+bun run test:acceptance:cucumber
+```
+
+### Run with pretty formatter (visible output)
+```bash
+bun run test:acceptance:cucumber:pretty
+```
+
+### Run specific feature file
+```bash
+bun cucumber-js e2e/cucumber/features/user-registration.feature
+```
+
+### Run specific scenario
+```bash
+bun cucumber-js --name "Successful registration with valid data"
+```
+
+### Dry run (check for undefined steps)
+```bash
+bun cucumber-js --config e2e/cucumber/cucumber.config.ts --dry-run
+```
+
+## Test Structure
+
+```
+e2e/cucumber/
+├── features/           # Gherkin feature files
+│   ├── user-registration.feature
+│   └── authentication.feature
+├── step-definitions/   # Step implementations
+│   ├── common-steps.ts    # Navigation, forms, assertions
+│   └── auth-steps.ts      # Login, logout, registration
+├── support/            # Test infrastructure
+│   ├── world.ts       # Shared test context
+│   └── hooks.ts       # Before/After hooks
+├── cucumber.config.ts # Cucumber configuration
+└── README.md          # This file
+```
+
+## Example Test
+
+### Feature File (user-registration.feature)
+```gherkin
+Feature: User Registration
+  As a new user
+  I want to register for an account
+  So that I can participate in Euchre tournaments
+
+  Background:
+    Given I am on the registration page
+
+  Scenario: Successful registration with valid data
+    When I fill in "name" with "Test User"
+    And I fill in "email" with "test@example.com"
+    And I fill in "password" with "TestPassword123!"
+    And I click the "Create Account" button
+    Then I should be redirected to my profile page
+    And my user account should exist
+```
+
+### Step Definition (auth-steps.ts)
+```typescript
+Given('I am logged in as a player', async function () {
+  const credentials = generateTestCredentials();
+  world.user = credentials;
+  
+  await world.page.goto(`${world.baseURL}/auth/register`);
+  await world.page.fill('input[name="name"]', credentials.name);
+  await world.page.fill('input[name="email"]', credentials.email);
+  await world.page.fill('input[name="password"]', credentials.password);
+  await world.page.click('button[type="submit"]');
+  await world.page.waitForURL(/\/players\/\d+\/profile/);
+});
+```
+
+## Tags
+
+Use tags to organize and filter tests:
+
+- `@happy-path` - Tests successful user workflows
+- `@negative-test` - Tests error cases and validation
+- `@authentication` - Tests related to login/registration
+- `@wip` - Work in progress (skipped by default)
+- `@skip` - Temporarily skipped tests
+
+## Configuration
+
+The Cucumber configuration is in `cucumber.config.ts`:
+
+- Feature files: `e2e/cucumber/features/**/*.feature`
+- Step definitions: `e2e/cucumber/step-definitions/**/*.ts`
+- TypeScript loader: tsx (for path alias support)
+- Tags: Skips `@wip` and `@skip` by default
+- Retries: 2 retries in CI environment
+
+## World Context
+
+The `world.ts` file provides a shared context for tests:
+
+```typescript
+interface WorldState {
+  page: Page;           // Playwright page
+  context: BrowserContext;
+  baseURL: string;      // Dev server URL
+  user?: {              // Current test user
+    email: string;
+    name: string;
+    password: string;
+  };
+  tournament?: any;     // Current test tournament
+  player?: any;         // Current test player
+}
+```
+
+## Hooks
+
+Hooks run before/after tests:
+
+- `BeforeAll` - Launch browser once before all tests
+- `AfterAll` - Close browser and cleanup after all tests
+- `Before` - Create new page context before each scenario
+- `After` - Close page and cleanup test data after each scenario
+
+## Best Practices
+
+1. **Unique test data**: Use timestamps to ensure unique test users
+2. **Wait for navigation**: Always wait for page loads and redirects
+3. **Clear assertions**: Verify expected state after user actions
+4. **No database access**: Use UI/API for all data creation
+5. **Tag organization**: Use tags to filter test suites
+6. **One assertion per step**: Keep steps focused and readable
+
+## Troubleshooting
+
+### Steps showing as undefined
+Run with `--dry-run` to check step matching:
+```bash
+bun cucumber-js --dry-run
+```
+
+### Database errors
+These tests don't interact with the database directly. If you see Prisma errors, check that:
+- The dev server is running
+- The database is accessible
+- Environment variables are set correctly
+
+### Slow tests
+Use the `@wip` tag for tests in development and skip them during full runs.
+
+## CI/CD Integration
+
+In CI, the tests should:
+1. Start the dev server (if not already running)
+2. Run Cucumber tests against `http://localhost:3000`
+3. Use JUnit format for reporting:
+   ```bash
+   bun cucumber-js --format junit --out reports/cucumber.xml
+   ```
+
+## Related
+
+- [Cucumber.js Documentation](https://github.com/cucumber/cucumber-js)
+- [Gherkin Syntax Reference](https://cucumber.io/docs/gherkin/)
+- [Playwright Documentation](https://playwright.dev)