Add issue/pr templates

.github/ISSUE_TEMPLATE.md

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+## Before you hit that Submit button....
+
+This issue tracker is for problems with the Node-RED runtime, the editor or the
+core nodes.
+
+If your issue is:
+
+  - a general 'how-to' type question,
+  - a feature request or suggestion for a change,
+  - or problems with 3rd party (`node-red-contrib-`) nodes
+
+please use the
+[mailing list](https://groups.google.com/forum/#!forum/node-red),
+[slack team](https://nodered.org/slack) or ask a question on [Stack Overflow](https://stackoverflow.com/questions/tagged/node-red) and tag it `node-red`.
+
+That way the whole Node-RED user community can help, rather than rely on the core development team.
+
+## So you have a real issue to raise...
+
+To help us understand the issue, please fill-in as much of the following information
+as you can:
+
+### What are the steps to reproduce?
+
+### What happens?
+
+### What do you expect to happen?
+
+### Please tell us about your environment:
+
+- [ ] Node-RED version:
+- [ ] node.js version:
+- [ ] npm version:
+- [ ] Platform/OS:
+- [ ] Browser:

.github/PULL_REQUEST_TEMPLATE.md

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+## Before you hit that Submit button....
+
+Please read our [contribution guidelines](https://github.com/node-red/node-red/blob/master/CONTRIBUTING.md)
+before submitting a pull-request.
+
+## Types of changes
+
+What types of changes does your code introduce?
+_Put an `x` in the boxes that apply_
+
+- [ ] Bugfix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+
+If you want to raise a pull-request with a new feature, or a refactoring
+of existing code, it **may well get rejected** if it hasn't been discussed on
+the [mailing list](https://groups.google.com/forum/#!forum/node-red) or
+[slack team](https://nodered.org/slack) first.
+
+
+## Proposed changes
+
+Describe the nature of this change. What problem does it address?
+
+## Checklist
+_Put an `x` in the boxes that apply_
+
+- [ ] I have read the [contribution guidelines](https://github.com/node-red/node-red/blob/master/CONTRIBUTING.md)
+- [ ] For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
+- [ ] I have run `grunt` to verify the unit tests pass
+- [ ] I have added suitable unit tests to cover the new/changed functionality