DOC: Added CONTRIBUTING.rst (numpy#27469)

* added CONTRIBUTING.rst

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* updated - addressing charris's comment

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Co-authored-by: Xiao Yuan <[email protected]>

* [skip actions][skip azp][skip cirrus]

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Co-authored-by: Xiao Yuan <[email protected]>

Author: Schefflera-Arboricola

CONTRIBUTING.rst

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+===============================
+NumPy's Contributing guidelines
+===============================
+
+Welcome to the NumPy community! We're excited to have you here.
+Whether you're new to open source or experienced, your contributions
+help us grow.
+
+Pull requests (PRs) are always welcome, but making a PR is just the
+start. Please respond to comments and requests for changes to help
+move the process forward. Please follow our
+`Code of Conduct <https://numpy.org/code-of-conduct/>`__, which applies
+to all interactions, including issues and PRs.
+
+For more, please read https://www.numpy.org/devdocs/dev/index.html
+
+Thank you for contributing, and happy coding!

doc/source/dev/index.rst

@@ -19,6 +19,21 @@ we list them in alphabetical order):
 - Website design and development
 - Writing technical documentation
 
+We understand that everyone has a different level of experience,
+also NumPy is a pretty well-established project, so it's hard to
+make assumptions about an ideal "first-time-contributor". 
+So, that's why we don't mark issues with the "good-first-issue"
+label. Instead, you'll find `issues labeled "Sprintable" <https://github.com/numpy/numpy/labels/sprintable>`__.
+These issues can either be:
+
+- **Easily fixed** when you have guidance from an experienced
+  contributor (perfect for working in a sprint).
+- **A learning opportunity** for those ready to dive deeper,
+  even if you're not in a sprint. 
+
+Additionally, depending on your prior experience, some "Sprintable"
+issues might be easy, while others could be more challenging for you.
+
 The rest of this document discusses working on the NumPy code base and documentation.
 We're in the process of updating our descriptions of other activities and roles.
 If you are interested in these other activities, please contact us!