Add CONTRIBUTING.md and issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug in the PerpCity SDK
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior:
+1. Code snippet or minimal reproduction
+2. Expected output vs actual output
+
+**Expected behavior**
+What you expected to happen.
+
+**Environment**
+- SDK version: [e.g. 0.4.3]
+- Runtime: [e.g. Bun 1.2, Node 22]
+- OS: [e.g. macOS 15, Ubuntu 24.04]
+
+**Additional context**
+Any other context, stack traces, or error messages.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature for the PerpCity SDK
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+**What problem does this solve?**
+A clear description of the use case or pain point.
+
+**Proposed solution**
+How you think this could be implemented.
+
+**Alternatives considered**
+Any alternative solutions or workarounds you've considered.
+
+**Additional context**
+Any other context or examples.

CONTRIBUTING.md

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+# Contributing to PerpCity SDK
+
+Thanks for your interest in contributing! This document covers everything you need to get started.
+
+## Prerequisites
+
+- [Bun](https://bun.sh/) (recommended) or Node.js >= 18
+- [pnpm](https://pnpm.io/)
+
+## Getting Started
+
+```bash
+git clone https://github.com/StrobeLabs/perpcity-sdk.git
+cd perpcity-sdk
+pnpm install
+```
+
+## Development
+
+```bash
+# Build
+pnpm build
+
+# Run unit tests
+pnpm test:unit
+
+# Run integration tests (requires Base Sepolia RPC)
+pnpm test:integration
+
+# Lint
+pnpm lint
+
+# Format
+pnpm format
+
+# Full CI check (build + test + typecheck + lint)
+pnpm ci
+```
+
+## Pull Requests
+
+1. Fork the repo and create a branch from `main`
+2. Write your code and add tests for new functionality
+3. Run `pnpm ci` to verify everything passes
+4. Open a PR against `main`
+
+## Code Style
+
+- Follow [Biome](https://biomejs.dev/) formatting and linting rules (enforced by CI)
+- Use TypeScript strict mode
+- Write tests for new functionality using [Vitest](https://vitest.dev/)
+
+## Reporting Issues
+
+- Use the bug report template for bugs
+- Use the feature request template for new features
+- Include SDK version, Node/Bun version, and steps to reproduce
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT License.