Create issue template (#4993)

ISSUE_TEMPLATE.md

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+<!---
+Thanks for filing an issue 😄! Before you submit, please read the following:
+
+Search open/closed issues before submitting since someone might have asked the same thing before!
+Our issues history stretches back to 2009, so the odds are good that your topic has come up.
+
+If you have a support request or question please use Stack Overflow:
+https://stackoverflow.com/questions/tagged/coffeescript
+
+Issues on GitHub are only related to problems of the CoffeeScript compiler itself and we cannot answer 
+support questions here.
+-->
+
+Choose one: is this a bug report or feature request?
+
+<!---
+Provide a general summary of the issue in the title above.
+
+For bugs, please also preface your title with “Bug:”. For feature requests, please preface your title
+with “Proposal:”. Once your issue is reviewed, a maintainer will edit the title to refer to the part
+of the codebase most relevant to the issue (if applicable).
+
+If your request is that CoffeeScript support a new feature recently arrived to JavaScript, please note
+that we generally only add features that have reached Stage 4 in the specification (in other words, 
+the syntax is finalized and the feature is approved to be part of the next ES release). You can still
+open an issue, but it will likely be tagged with “[Awaiting Stage 4]” until the relevant ES feature is
+approved for release. See http://coffeescript.org/#contributing
+
+There are also a handful of JavaScript features that CoffeeScript intentionally does not support.
+Please do not open issues regarding these. They’re listed in http://coffeescript.org/#unsupported
+-->
+
+### Input Code
+<!--- If you're describing a bug, please let us know which sample code reproduces your problem. -->
+<!--- If you have link from http://coffeescript.org/#try or a standalone repo please include that! -->
+
+```coffee
+your (code) => here
+```
+
+### Expected Behavior
+<!--- If you’re describing a bug, tell us what should happen. -->
+<!--- If you’re suggesting a change/improvement, tell us how it should work. -->
+
+### Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior. -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior. -->
+
+### Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change. -->
+
+### Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world. -->
+
+### Environment
+<!--- For bugs, please let us know what version of CoffeeScript you’re running: `coffee -v`. -->
+<!--- If you think it might be relevant, please also let us know your version of Node. -->
+
+* CoffeeScript version:
+* Node.js version: