Create CONTRIBUTING.md

CONTRIBUTING.md

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+## How to contribute
+
+#### **Software bug**
+
+* **Check whether the bug has already been reported** by searching this repository's [issues](https://github.com/0todd0000/spm1d/issues).
+
+* If no issue addressing the problem already exists, [open a new issue](https://github.com/0todd0000/spm1d/issues/new/). Include a **concise, clear title and a minimal, clear description**, as much relevant information as possible, and preferably a [minmal reproducible example](https://en.wikipedia.org/wiki/Minimal_reproducible_example) demonstrating the problem.
+
+* For additional details please visit our [Support page](https://spm1d.org/Support.html).
+
+#### **Bug fix?**
+
+* First check for existing software bug reports (see above). If none exists then...
+
+* Open a new GitHub pull request with the bug fix. Ensure that your description clearly describes the problem and the solution. Include relevant issue number(s) if applicable.
+
+#### **Cosmetic fix?**
+
+Code changes that are purely cosmetic in nature (e.g. whitespace / tab changes) and do not add anything substantial to the stability, functionality, or testability of Rails should generally be avoided unless the changes substantially improve code readability.
+
+#### **New feature?**
+
+* Suggest your change by posting a comment in [feature requests](https://github.com/0todd0000/spm1d/issues/45)
+
+* Do not open a new issue on GitHub until the suggested change has collected positive feedback. New GitHub issues are primarily intended for bug reports and fixes.
+
+#### **Source code questions?**
+
+* Feel free to ask questions about the source code in this repository's [issues](https://github.com/0todd0000/spm1d/issues). Please follow "Software bug" protocol (above) as closely as possible.
+
+#### **General statistics questions?**
+
+* Please avoid posting statistics / interpretation questions to this repository's [issues](https://github.com/0todd0000/spm1d/issues). Statistics questions should generally posted to other forums like [Stack Overflow](https://stackoverflow.com) or [Stats @ Stack Exchange](https://stats.stackexchange.com).
+
+This repository is a volunteer effort. We encourage all to [contribute!](https://github.com/0todd0000/spm1d/blob/master/CODE_OF_CONDUCT.md)!
+
+The spm1d Team