Add issue and pull request templates

ISSUE_TEMPLATE.md

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+If you have questions about the [API](http://interactjs.io/api) that aren't
+answered in the [docs](http://interactjs.io/docs) or
+[FAQ](http://interactjs.io/docs/faq), try asking in the [Gitter
+chatroom](https://gitter.im/taye/interact.js) or on
+[Stackoverflow](https://stackoverflow.com/questions/tagged/interact.js).
+
+If you've found something that looks like a bug, include a link to a minimal
+demo on [JSFilddle](https://jsfiddle.net), [Codepen](https://codepen.io) with
+instructions to reproduce the bug with and roughly follow the following issue
+description format:
+
+### Expected behavior
+Tell us what should happen
+
+### Actual behavior
+Tell us what happens instead
+
+### System configuration
+**interact.js version**:
+**Browser name and version**:
+**Operating System**:

PULL_REQUEST_TEMPLATE.md

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+Make sure to include tests in your pull request.