Add github templates

.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-nodes/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-nodes/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