Add README for tsx ESM test case

Co-authored-by: kobenguyent <7845001+kobenguyent@users.noreply.github.com>

Author: Copilot

test/data/typescript-tsx-esm/README.md

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+# TypeScript tsx ESM Test
+
+This test demonstrates the recommended way to use TypeScript with CodeceptJS 4.x when you have `"type": "module"` in your package.json.
+
+## Key Features
+
+- Uses `tsx/cjs` as the TypeScript loader (recommended over ts-node/esm)
+- Has `"type": "module"` in package.json
+- Imports page objects without file extensions
+- Everything works seamlessly
+
+## Configuration
+
+- **Loader**: `tsx/cjs` in `require` array
+- **Package type**: `"module"`
+- **TypeScript module**: `"esnext"` with `"node"` module resolution
+- **Imports**: No file extensions needed (tsx handles resolution)
+
+## Why tsx?
+
+tsx is the recommended TypeScript loader for CodeceptJS 4.x because:
+- ✅ Works with `"type": "module"`
+- ✅ Handles extensionless imports
+- ✅ Fast (built on esbuild)
+- ✅ Zero config needed
+- ✅ Compatible with Mocha's loading system
+
+## Why Not ts-node/esm?
+
+ts-node/esm has significant limitations:
+- ❌ Doesn't work with `"type": "module"`
+- ❌ Doesn't resolve extensionless imports to .ts files
+- ❌ Requires complex configuration
+- ❌ Module resolution doesn't work like standard TypeScript ESM
+
+## Running This Test
+
+```bash
+cd test/data/typescript-tsx-esm
+../../../bin/codecept.js run --verbose
+```
+
+You should see both scenarios pass successfully.