docs: add EchoCoding to related projects (#48)

Co-authored-by: 雷浪声 <leilangsheng@leilangshengdeMacBook-Pro.local>

Author: launsion-boop

README.md

@@ -205,6 +205,7 @@ The score is best used as a quick trust signal and triage summary (not the only
 - [awesome-claude-code](https://github.com/hesreallyhim/awesome-claude-code#readme) - Claude Code resources.
 - [awesome-coding-agents](https://github.com/e2b-dev/awesome-ai-agents#readme) - Curated list of AI coding agents.
 - [awesome-mcp-servers](https://github.com/wong2/awesome-mcp-servers#readme) - MCP server directory.
+- [EchoCoding](https://github.com/launsion-boop/EchoCoding) - Voice-enabled audio layer for coding agents with ambient soundscapes, event-driven SFX, and optional cloud TTS/ASR interaction.
 - [HOL Plugin Registry](https://hol.org/registry/plugins) - Browse plugins with scanner-backed security analysis and trust scores.
 - [awesome-ai-plugins](https://github.com/hashgraph-online/awesome-ai-plugins) - Umbrella list covering Codex, Claude Code, Gemini CLI, and MCP servers.