Add CONTRIBUTION and CODE_OF_CONDUCT files

CODE_OF_CONDUCT.md

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+Please note that the Consortium for Python Data API Standards has a Code of
+Conduct that we ask everyone to respect, see:
+https://github.com/data-apis/.github/blob/master/CODE_OF_CONDUCT.md

CONTRIBUTING.md

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+# Contributing to the Array API Standard
+
+Thank you for your interest in contributing!
+
+
+## Contributing 
+
+If you would like to contribute textual clarifications or other "maintenance
+type" changes, please open a pull request on the
+https://github.com/data-apis/array-api repository.
+
+If you would like to add more functionality to the Array API Standard, please
+take note of:
+- the Scope section of the standard
+- the [document outlining the Consortium's Process for standardization](https://github.com/data-apis/governance/blob/master/process_document.md)
+before opening a pull request. If your proposed addition seems in scope,
+opening an issue for discussion may be more appropriate as a first step.
+
+
+## Reporting issues
+
+Please use the [issue tracker](https://github.com/data-apis/array-api/issues)
+for reporting issues with the published Array API Standard. 
+
+Please note that *implementation* issues should be reported to the project
+implementing the standard.