**Changes Made:**

1. **Version Update:**
   - Updated all version references from 0.15.0 to 0.16.0 across documentation files
   - Affected files: README-CN.md, README.md, rmqtt/README.md

2. **New Feature Documentation:**
   - Added P2P Messaging plugin to feature lists in both Chinese and English READMEs
   - Added documentation links for P2P Messaging feature:
     * Chinese: `./docs/zh_CN/p2p-messaging.md`
     * English: `./docs/en_US/p2p-messaging.md`

3. **Documentation Structure:**
   - Maintained consistent formatting with existing plugin documentation
   - Added P2P Messaging to the plugin features list alongside other plugins

**Files Modified:**
* README-CN.md - Updated version and added Chinese P2P messaging docs
* README.md - Updated version and added English P2P messaging docs
* rmqtt/README.md - Updated version references in library usage examples

This update prepares for the 0.16.0 release and documents the new P2P messaging capability.