Add high-level Rondevu client with three connection methods

- Add Rondevu class with join(), connect(), and create() methods
- Add RondevuConnection wrapper for WebRTC connections
- Add event emitter for connection events
- Update to ES modules (ESNext) for Vite compatibility
- Simplify README to be more concise
- Update package.json to specify type: module

Three ways to connect:
- join(topic) for auto-discovery
- join(topic, {filter}) for peer ID filtering
- create(id)/connect(id) for direct connections

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,7 +1,8 @@
 {
   "name": "@xtr-dev/rondevu-client",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "TypeScript client for Rondevu peer signaling and discovery server",
+  "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "scripts": {