zaru-core 0.1.0

A secure payment model engine with transaction state machine and cryptographic verification
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### 6. Create `CONTRIBUTING.md`

```markdown
# Contributing to Zaru Core

Thank you for your interest in contributing! We follow Rust best practices and welcome all contributions.

## Development Setup

1. **Clone the repository**
```bash
git clone https://github.com/KhodingNow/zaru-core.git
cd zaru-core