docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+\# Contributing to schema-cast
+
+
+
+Thank you for your interest in contributing!
+
+
+
+\## Getting Started
+
+
+
+```bash
+
+git clone https://github.com/Demon-Die/schema-cast.git
+
+cd schema-cast
+
+npm install
+
+npm run dev
+
+```
+
+
+
+\## Running Tests
+
+
+
+```bash
+
+npm test
+
+```
+
+
+
+\## Schema File Conventions
+
+
+
+\- Define your schema in `.schema.json` format
+
+\- Follow the structure shown in `example.schema.json`
+
+
+
+\## Code Style
+
+
+
+\- Use TypeScript
+
+\- Keep code clean and well-commented
+
+
+
+\## PR Process
+
+
+
+\- Large PRs should be preceded by an issue first
+
+\- Reference the issue number in your PR
+