Add issue & pull request templates

Related to donejs/developer-relations#15

.github/ISSUE_TEMPLATE.md

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+<!--
+Please use the labels on the right to classify your issue as a bug, enhancement, or question.
+
+If you’re filing a bug, please provide the following information:
+-->
+
+__How often can you reproduce it?__ <!-- Use [x] to mark your choice. -->
+
+- [ ] Always
+- [ ] Sometimes
+- [ ] Rarely
+- [ ] Unable
+- [ ] I didn’t try
+
+<!-- Please provide a detailed description of the issue. Include specific details to help us understand the problem. -->
+
+__Description:__
+
+
+
+<!-- List the step-by-step process to reproduce the issue. -->
+
+__Steps to reproduce:__
+
+1. Include a JS Bin (or equivalent) link if possible
+2. Detail the exact steps taken to produce the problem
+3. Include a gif if possible; you can use LICEcap to make a gif: http://www.cockos.com/licecap/
+
+<!-- Describe what you expected to have happen after completing the steps above. -->
+
+__Expected results:__
+
+
+
+<!-- Describe what actually happened after completing the steps above. -->
+
+__Actual results:__
+
+
+
+<!-- Include details about your environment. -->
+
+__Environment:__
+
+| Software                   | Version
+| -------------------- | -------
+| can-define version   | 
+| Browser                    | 
+| Operating system    | 

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for your contribution!
+
+Please make sure your pull request (PR) includes documentation and/or test updates.
+
+In this PR description, please include a link to the issue(s) your PR addresses. If you include the issue number(s) in your commit(s), GitHub can automatically close the original issue(s): https://help.github.com/articles/closing-issues-via-commit-messages/
+
+If applicable, please include a screenshot or gif to demonstrate your change. This makes it easier for reviewers to verify that it works for them. You can use LICEcap to make a gif: http://www.cockos.com/licecap/
+-->