Merge pull request reduxjs#1780 from markerikson/add-issue-template

Add an initial issue template based on React's template

Author: markerikson

.github/ISSUE_TEMPLATE.md

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+**Do you want to request a *feature* or report a *bug*?**  
+(If this is a *usage question*, please **do not post it here** - post it on [Stack Overflow](http://stackoverflow.com/questions/tagged/redux) instead. If this is not a "feature" or a "bug", or the phrase "How do I...?" applies, then it's probably a usage question.)
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+**What is the current behavior?**
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+**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar.**
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+**What is the expected behavior?**
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+**Which versions of Redux, and which browser / OS are affected by this issue? Did this work in previous versions of Redux?**
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