add github templates (#612)

.github/ISSUE_TEMPLATE.md

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+### Description
+
+[Description of the bug or feature]
+
+### Expected behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+### Actual behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+### Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Pure version:
+* Browser name and version:
+* Link to your project or example:

.github/PULL_REQUEST_TEMPLATE.md

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+Please consider the following before submitting a pull request:
+
+Guidelines for contributing: https://github.com/yahoo/pure/blob/master/CONTRIBUTING.md
+
+Example of changes on an interactive website such as the following:
+
+- http://jsbin.com/
+- http://jsfiddle.net/
+- http://codepen.io/pen/