Create ISSUE_TEMPLATE.md

Author: mpeyper

.github/ISSUE_TEMPLATE.md

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+<!--
+
+* Please fill out this template with all the relevant information so we can
+  understand what's going on. We appreciate issues filed and PRs
+  submitted!
+
+* Please make sure that you are familiar with and follow the Code of Conduct for
+  this project (found in the CODE_OF_CONDUCT.md file).
+  
+* If this issue is a bug, feature request or question, there are specific templates that can be used for those:
+  https://github.com/mpeyper/react-hooks-testing-library/issues/new/choose
+
+-->
+
+### What is this issue about:
+
+<!-- Why are you filing this issue? Please be as detailed as possible. -->