Merge pull request #362 from handrews/contrib

Start a contributing guide from the wiki contents.

Author: handrews

CONTRIBUTING.md

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+# Guidelines for contributing to the JSON Schema project
+
+## Issues
+
+Issues should identify an problem, enhancement, or use case; and propose some course of action for the draft. For alternate support channels, [see the json-schema.org website](http://json-schema.org/).
+
+Issues waiting for user feedback will be tagged "Feedback". Up to two weeks will be given for feedback to be provided.
+
+If there seems to be consensus around an issue, the issue will be taken up (and tagged with a milestone) or closed.
+
+## Pull requests
+
+We welcome pull requests, both for editorial suggestions and to resolve open issues.
+
+If the pull request would solve a particular issue, reference the issue in the pull request description.
+
+Changes that would affect implementation behavior should typically be opened as an issue first.
+
+Pull requests should be made to master.
+
+## Writing guidelines
+
+An Internet-Draft publication replaces previous documents in their entirety. Behavorial changes to the document should be reverse-compatible with existing written schemas, or allow for implementations to implement old and removed behavior.
+
+The meta-schema URI is used to differentiate between different vocabularies (Validation and Hyper-schema). The authority on JSON Schema behavior is the respective specification document, not the JSON meta-schema; the JSON version of the meta-schema is maintained in an informative capacity only. However, the meta-schema URI referred to in the document should desginate a fixed JSON document, and updates to this document should be publised at a new URI. Updates should be made to the meta-schema and published at a time when it becomes desirable for new behaviors and features to be described in this fashion.
+
+The "master" branch should always be Internet-Draft ready. The document editor is responsible for ensuring that the writing meets best practices for an I-D. An I-D will be published from "master" branch when wider review is desired, at the editor's discretion.
+
+## Conduct
+
+All official channels including the mailing list, GitHub organization, and Freenode channel, follow the IETF Guidelines for Conduct as specified in [RFC7154](https://tools.ietf.org/html/rfc7154).