Add CONTRIBUTING.md and issue template

Author: dstillman

Diff for: .github/ISSUE_TEMPLATE.md

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+**READ THIS BEFORE CREATING AN ISSUE**
+
+Zotero does not use GitHub Issues for bug reports or feature requests.
+
+Please post all such requests to the Zotero Forums at https://forums.zotero.org, where Zotero developers and many others can help. For confirmed bugs or agreed-upon changes, Zotero developers will create new issues in the relevant repositories.
+
+Development questions involving code, APIs, or other technical topics can be posted to the zotero-dev mailing list at http://groups.google.com/group/zotero-dev.
+
+See https://www.zotero.org/support/zotero_support for more information on how Zotero support works.

Diff for: CONTRIBUTING.md

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+# Contributing to Zotero
+
+## Bug Reports and Feature Requests
+
+Zotero does not use GitHub Issues for bug reports or feature requests. Please post all such requests to the [Zotero Forums](https://forums.zotero.org), where Zotero developers and many others can help. See [How Zotero Support Works](https://www.zotero.org/support/zotero_support) for more information.
+
+For confirmed bugs or agreed-upon changes, Zotero developers will create new issues in the relevant repositories.
+
+## Working with Zotero Code
+
+See [Zotero Source Code](https://www.zotero.org/support/dev/source_code).