Add issue templates

Author: garyrussell

.github/ISSUE_TEMPLATE.md

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+<!--
+!!! To report Security Vulnerabilities, please go to https://pivotal.io/security !!!
+-->
+**Affects Version(s):** \<Spring AMQP version>
+
+---
+<!--
+Thanks for raising a Spring AMQP issue. What sort of issue are you raising?
+
+## Question
+
+Please ask questions about how to use something, or to understand why something isn't
+working as you expect it to, on
+[Stack Overflow using the `spring-amqp` tag](https://stackoverflow.com/questions/tagged/spring-amqp).
+
+## Bug report
+
+Please provide details of the problem, including the version of Spring AMQP that you
+are using. If possible, please provide a test case or sample application that reproduces
+the problem. This makes it much easier for us to diagnose the problem and to verify that
+we have fixed it.
+
+## Enhancement
+
+Please start by describing the problem that you are trying to solve. There may already
+be a solution, or there may be a way to solve it that you hadn't considered.
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thanks for contributing to Spring AMQP. Please provide a brief description of your pull-request and reference any related issue numbers (prefix references with #).
+
+See the [Contributor Guidelines for more information](https://github.com/spring-projects/spring-amqp/blob/master/CONTRIBUTING.adoc).
+-->