Improve Issue Template

Summary: This adds a few issue templates to make opening issues a better experience. See https://github.com/jbrown215/test-issue-template/issues/new/choose to see how these look.

Reviewed By: nmote

Differential Revision: D13856723

fbshipit-source-id: 345a51216f6c491a5bd08ab55955fe94b7b3e1ad

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "Bug report"
+about: You want to report a reproducible bug or regression in Flow.
+labels: bug
+---
+
+<!--
+Please fill out this entire template so that we can address your bug report as quickly as possible.
+
+Any bug reports that don't contain instructions to reproduce the issue will be closed.
+-->
+
+Flow version:
+
+## Expected behavior
+
+## Actual behavior
+
+<!--
+Please reproduce your issue on flow.org/try so that we can debug it.
+
+Not all issues are reproducible on try-flow because they may require multiple
+files or specific flowconfig settings. If your bug can only be reproduced
+under one of these constraints, please make a small github repo that
+contains a minimal way to reproduce your problem.
+-->
+* Link to Try-Flow or Github repo:

.github/ISSUE_TEMPLATE/discussion.md

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+---
+name: "Discussion"
+about: You want to propose a change to Flow.
+labels: "discussion"
+---
+
+<!--
+Please fill out this entire template so that we can evaluate your proposal as quickly as possible.
+-->
+
+## Proposal
+
+<!--
+  Explain why you need this change and why this cannot be addressed with Flow's current set of features.
+-->
+## Use case

.github/ISSUE_TEMPLATE/documentation.md

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+---
+name: "Documentation"
+about: You want to report missing or incorrect documentation.
+labels: documentation
+---
+
+<!--
+Please explain what documentation is missing or incorrect.
+-->
+
+

.github/ISSUE_TEMPLATE/libdef.md

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+---
+name: "Library Definitions"
+about: You want to report an issue with Flow's library definitions.
+labels: "Library definitions"
+---
+
+<!--
+Please fill out this entire template so that we can address your report as quickly as possible.
+-->
+
+<!--
+Explain what APIs are not modeled by Flow or could be improved
+-->
+## Missing/Incorrect APIs
+
+<!--
+Please include documentation for the missing APIs.
+-->
+## Relevant documentation

.github/ISSUE_TEMPLATE/question.md

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+---
+name: "Question"
+about: Please direct all questions to stackoverflow.com
+labels: question
+---
+
+<!-- Please direct your questions to stackoverflow.com and use the flowtype tag.
+  We will close any questions opened on this repo.
+-->
+
+
+PLEASE DIRECT YOUR QUESTION TO STACKOVERFLOW.COM