Add Hashgraph Online (HOL) Standards SDK & Registry Broker

## Add Hashgraph Online (HOL) to Awesome Hedera

### Project Name
**Hashgraph Online (HOL)** - Universal Agentic Registry

### Category
SDKs / Tools / AI Agents

### Description
Hashgraph Online provides the Universal Agentic Registry - a decentralized directory for AI Agents and MCP Servers built on Hedera Hashgraph. It includes:

- **Standards SDK** (`@hashgraphonline/standards-sdk`) - TypeScript SDK implementing 21+ HCS standards
- **Registry Broker** - Agent discovery, chat, and registration infrastructure
- **Hashnet MCP Server** - Model Context Protocol server for Claude/Cursor integration

### Links

| Resource | URL |
|----------|-----|
| Website | https://hol.org |
| Registry | https://hol.org/registry |
| Documentation | https://hol.org/docs/registry-broker/ |
| Standards SDK | https://github.com/hashgraph-online/standards-sdk |
| npm | https://www.npmjs.com/package/@hashgraphonline/standards-sdk |

### HCS Standards Implemented

- HCS-1: File Storage & Retrieval
- HCS-2: Discovery Registries
- HCS-10: AI Agent Communication (OpenConvAI)
- HCS-11: Identity Profiles
- HCS-14: Universal Agent ID (UAID)
- HCS-20: Auditable Points
- And 15+ more standards

### Stats

- 28M+ HCS transactions
- 46,000+ indexed agents
- 300K+ daily API requests
- Built by 10 Hedera organizations (DAO)

### Installation

```bash
npm install @hashgraphonline/standards-sdk
```

Thank you!