add_contributing

Author: eranra

CONTRIBUTING.md

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+# Contributing to flowlogs2metrics
+
+:fire: A big welcome and thank you for considering contributing to flowlogs2metrics open source project! :fire:  
+
+We want to make contributing to this project as easy and transparent as possible. 
+Please read the following notes to learn how the contribute process works.
+
+## Pull Request Process
+
+1. Follow [pull requests](http://help.github.com/pull-requests/) guidelines.
+1. We use git actions to gate pull requests.   
+   - Pull Requests need to at least pass `make build` and `make test`.
+   - Pull Requests need to be approved by at least one reviewer.  
+1. For golang code, follow standard coding convention as described [here](https://go.dev/doc/effective_go).
+   - Use `go fmt` and `golangci-lint` to lint and verify code style.
+1. for all other contributions, follow existing project coding style (by example).    
+1. Connecting an issue to pull Request is always a preference.
+1. Always write a clear log message for your commits. One-line messages are fine for small changes, 
+   but bigger changes should look like this:
+   
+```shell
+> git commit -m "A brief summary of the commit
+
+A paragraph describing what changed and its impact."
+```
+
+## Bugs, enhancements and questions
+
+1. Use git [issues](https://docs.github.com/en/issues/tracking-your-work-with-issues/about-issues) to document bugs, enhancements and questions.
+1. Be as clear, concise and simple as possible.
+1. Good example can always help to clear things. Please use examples when possible.
+
+
+## Code of Conduct
+
+### Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+### Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+### Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+### Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+### Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+### Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at [http://contributor-covenant.org/version/1/4][version]
+
+