Add CONTRIBUTING.md.

CONTRIBUTING.md

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+# Contributing to electron-trpc
+
+We welcome contributions from the community. This guide assumes you're familiar with Git, GitHub, and pnpm.
+
+## Quick Start
+
+1. Fork and clone the repository
+2. Install dependencies: `pnpm install`
+3. Create a new branch for your feature
+4. Make changes and commit
+5. Run tests: `pnpm test`
+6. Create a changeset: `pnpm changeset`
+7. Push to your fork and submit a pull request
+
+## Monorepo Structure
+
+This project uses a pnpm monorepo structure. The main directories are:
+
+- `examples/`: Contains examples of various use-cases and serves as the basis for e2e tests
+- `packages/`: Houses the main electron-trpc package
+
+## Scripts
+
+These are the most likely scripts you'll want to use during development:
+
+- `pnpm install`: Install dependencies for all packages
+- `pnpm test`: Run tests across all packages
+- `pnpm test:e2e`: Run end-to-end tests
+- `pnpm build`: Build all packages
+- `pnpm changeset`: Create a changeset for your changes
+
+## Reporting Issues
+
+Open an issue on GitHub for bugs or suggestions.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the project's [LICENSE](LICENSE) file.