Added contributing docs and Makefile for doing checks

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Be Respectful
+
+We are committed to providing a friendly, safe, and welcoming environment for all, regardless of background or identity.
+
+## Expected Behavior
+
+- Use welcoming and inclusive language
+- Be respectful of differing viewpoints
+- Provide constructive feedback
+- Show empathy towards others
+
+## Unacceptable Behavior
+
+- Harassment, insults, or personal attacks
+- Discriminatory jokes or language
+- Publishing others' private information
+- Any behavior that would make others feel unsafe
+
+## Enforcement
+
+Instances of unacceptable behavior may be reported to project maintainers. All reports will be reviewed and may result in consequences ranging from warning to permanent ban.
+
+## Attribution
+
+Adapted from the [Contributor Covenant](https://www.contributor-covenant.org).

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!

Makefile

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+default: help
+
+.PHONY: help
+help:   ## show this help
+	@echo 'usage: make [target] ...'
+	@echo ''
+	@echo 'targets:'
+	@egrep '^(.+)\:\ .*##\ (.+)' ${MAKEFILE_LIST} | sed 's/:.*##/#/' | column -t -c 2 -s '#'
+
+.PHONY: check
+check: check-format test lint  ## run all code checks
+
+.PHONY: lint
+lint:   ## lint the code with golangci-lint
+	golangci-lint run
+
+.PHONY: test
+test:   ## test the code with go test
+	go test -v ./...
+
+.PHONY: format
+format: ## format the code with goimports and tidy the go modules
+	go mod tidy -v
+	goimports -local git.maze.io/go/dpi -w *.go */*.go
+
+.PHONY: check-format
+check-format: ## check if the the code formatting and modules
+	go mod tidy -diff
+	goimports -local git.maze.io/go/dpi -l -w *.go */*.go
+
+.PHONY: tools
+tools:  ## fetch and install all required tools
+	go get -v -u golang.org/x/tools/cmd/goimports@latest