Add GitHub issues template to guide users (#1155)

.github/ISSUE_TEMPLATE.md

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+<!-- Thanks for filing an issue! Before hitting the button, please answer these questions. It's helpful to search the existing GitHub issues first. It's likely that another user has already reported the issue you're facing, or it's a known issue that we're already aware of-->
+
+**Is this a request for help?**:
+
+---
+
+**Is this a BUG REPORT or FEATURE REQUEST?** (choose one):
+
+<!--
+If this is a BUG REPORT, please:
+  - Fill in as much of the template below as you can.  If you leave out
+    information, we can't help you as well.
+
+If this is a FEATURE REQUEST, please:
+  - Describe *in detail* the feature/behavior/change you'd like to see.
+
+In both cases, be ready for followup questions, and please respond in a timely
+manner.  If we can't reproduce a bug or think a feature already exists, we
+might close your issue.  If we're wrong, PLEASE feel free to reopen it and
+explain why.
+-->
+
+**Version of Helm and Kubernetes**:
+
+
+**Which chart**:
+
+
+**What happened**:
+
+
+**What you expected to happen**:
+
+
+**How to reproduce it** (as minimally and precisely as possible):
+
+
+**Anything else we need to know**: