docs: add CONTRIBUTING.md (#16)

Co-authored-by: OpenClaw Bot <bot@openclaw.local>

Author: haosenwang1018

CONTRIBUTING.md

@@ -0,0 +1,39 @@
+# Contributing to Softaworks Agent Skills
+
+Thank you for your interest in contributing! Here's how to get started.
+
+## Adding a New Skill
+
+1. Create a new directory under the appropriate category
+2. Follow the [Agent Skills](https://agentskills.io/) format
+3. Include a `SKILL.md` with clear instructions
+4. Add relevant scripts and assets
+
+## Development Setup
+
+```bash
+# Clone the repository
+git clone https://github.com/softaworks/agent-toolkit.git
+cd agent-toolkit
+
+# Test a skill locally
+npx skills add . --skill <skill-name>
+```
+
+## Pull Request Process
+
+1. **Fork** the repository
+2. **Create a branch** from `main`: `git checkout -b feat/my-skill`
+3. **Follow existing patterns** — look at how current skills are structured
+4. **Test your changes** locally with Claude Code or another compatible agent
+5. **Submit a PR** with a clear description of what the skill does
+
+## Code Style
+
+- Use clear, descriptive names for skills and scripts
+- Include documentation in each skill's `SKILL.md`
+- Keep scripts focused and well-commented
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the project's existing license.