Added contributing docs and Makefile for doing checks

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing! This document outlines the process and requirements for contributing to this Go project.
+
+## Quick Start
+
+1. Fork the repository
+2. Create a feature branch (`git checkout -b feature/amazing-feature`)
+3. Make your changes
+4. Ensure code meets quality standards (see below)
+5. Submit a pull request
+
+## Code Quality Requirements
+
+### Go version
+
+We support Go version 1.25 and onwards.
+
+### Formatting with `goimports`
+
+All Go code **must** be formatted using `goimports`:
+
+```bash
+# Format all Go files
+goimports -local git.maze.io/go/dpi -l -w .
+
+# Install goimports if not available
+go install golang.org/x/tools/cmd/goimports@latest
+```
+
+### Linting with `golangci-lint`
+
+All code must pass [golangci-lint](https://golangci-lint.run/) checks:
+
+```bash
+# Run linter
+golangci-lint run
+```
+
+### Checking your code
+
+For convenience, all of the code checks can be run with a single command:
+
+```bash
+# Run all required code checks
+make check
+```
+
+#### Install golangci-lint if not available
+
+Please refer to the [official documentation](https://golangci-lint.run/docs/welcome/install/) for help on installong `golangci-lint`.
+
+## Development Workflow
+
+### Pre-commit Checklist
+
+* Code formatted with `goimports`
+* All `golangci-lint` checks pass
+* Tests are updated/passing
+* Documentation updated (if applicable)
+
+### Testing
+
+Run the test suite before submitting:
+
+```bash
+go test ./...
+```
+
+## Pull Request Guidelines
+
+* Keep changes focused and atomic
+* Update documentation for new features
+* Ensure CI checks pass
+* Respond to review feedback promptly
+
+## Getting Help
+
+* Open an issue for bug reports or questions
+* Use discussions for general questions
+* Contact maintainers for sensitive issues
+
+Thank you for contributing!