Merge pull request apache#8 from OpenLineage/julienledem-contributing

Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing Guide
+
+## Reporting an Issue
+
+Please use the [issues][issues] section of the OpenLineage repository and search for a similar problem. If you don't find it, submit your bug, question, proposal or feature request.
+
+In the case of bugs, please provide steps to reproduce it and tag your issue with "bug"
+
+## Creating Pull Requests
+
+Before sending a Pull Request with significant changes, please use the [issue tracker][issues] to discuss the potential improvements you want to make.
+
+## Proposing changes
+
+Create an issue and prefix the description with "[PROPOSAL]"
+
+In the description provide the following sections:
+ - Purpose (Why?): What is the use case this is for. 
+ - Proposed implementation (How?): Quick description of how do you propose to implement it. Are you proposing a new facet?
+
+This can be just a couple paragraphs to start with.
+
+## First-Time Contributors
+
+If this is your first contribution to open source, you can [follow this tutorial][contributiontutorial] or check [this video series][contributionvideos] to learn about the contribution workflow with GitHub.
+
+Look tickets labeled ['good first issue'][goodfirstissues] and ['help wanted'][helpwantedissues]. These are a great starting point if you want to contribute. Don't hesitate to ask questions about the issue if you are not sure about the strategy to follow.
+
+
+[issues]: https://github.com/OpenLineage/OpenLineage/issues
+[contributiontutorial]: https://github.com/firstcontributions/first-contributions#first-contributions
+[contributionvideos]: https://egghead.io/courses/how-to-contribute-to-an-open-source-project-on-github
+[goodfirstissues]: https://github.com/OpenLineage/OpenLineage/labels/good%20first%20issue
+[helpwantedissues]: https://github.com/OpenLineage/OpenLineage/labels/help%20wanted