Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Maestro
+
+Welcome! We're happy to have you join our community and contribute to the most powerful Dapp Developer Platform for Cardano!
+
+To learn more about Maestro [here](https://docs.gomaestro.org/)!
+
+## Opening Issues
+
+Use an [existing template](https://github.com/maestro-org/haskell-sdk/issues/new/choose) to:
+- Report a bug
+- Update the docs
+- Request a new feature
+
+Accompany your issue with one or more of the following labels:
+- `bug`
+- `dependencies`
+- `documentation`
+- `duplicate`
+- `github actions`
+- `good first issue`
+- `haskell`
+- `help wanted`
+- `vulnerability`
+- `wont fix`
+
+## Opening Pull Requests
+After opening a pull request, please take the following steps:
+- Ensure your PR has one or more corresponding issues (see above)
+- [Link your PR](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) to those issues
+- Check the [build status](https://github.com/maestro-org/haskell-sdk/actions/new) of your PR
+- Wait for a review and/or approval from one of the code owners
+- Merge and celebrate!
+
+The team will do their best to help you get your PRs across the finish line!