PR and Issue templates

Reviewed By: mkonicek

Differential Revision:D2946749
Ninja: GitHub-only

fb-gh-sync-id: ac8a316ca4c2982a063040d57ddc1f279b81b59d
shipit-source-id: ac8a316ca4c2982a063040d57ddc1f279b81b59d

ISSUE_TEMPLATE.md

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+React Native, as you've probably heard, is getting really popular and truth is we're getting a bit overwhelmed by the activity surrounding it. There are just too many issues for us to manage properly.
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+Here are good ways to get help:
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+- If you **don't know how to do something** or **not sure you've found a bug**, ask on [StackOverflow](http://stackoverflow.com/questions/tagged/react-native) with the tag `react-native`. StackOverflow is amazing for Q&A and it is likely the community will see and answer your question there.
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+- If this is a **feature request**, please report it on [Product Pains](https://productpains.com/product/react-native/). It has a ranking feature that lets us focus on the most important issues the community is experiencing.
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+- Is this something you can debug and fix quickly? **Send a pull request!**
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+If you want to file a GitHub issue, make sure it is actionable so someone can help:
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+- Provide **screenshots** where appropriate
+- What's the **version** of React Native you're using?
+- Does this occur on iOS, Android or both?
+- The operating system: Mac, Linux or Windows

PULL_REQUEST_TEMPLATE.md

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+Explain the motivation for making this change. What existing problem does the pull request solve?
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+Example: When saying "Add a function to do X", explain why it is necessary to have a way to do X.
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+**Test plan (required)**
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+Describe exact steps you've done to test that the code works. This means exact commands you ran, screenshots / videos if the pull request changes UI.
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+Make sure tests pass on Circle CI.
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+**Code formatting**
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+See the simple [style guide](https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md#style-guide).