feat: added issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,40 @@
+# PLEASE PROVIDE THE FOLLOWING INFORMATION.
+# ISSUES NOT FOLLOWING THE ISSUE TEMPLATE WILL BE CLOSED WITHOUT INVESTIGATION.
+
+- [ ] **I have searched for similar issues in this repository, but couldn't find one.**
+- [ ] **I have read the README and have a basic understanding how angular works.**
+## I'm submitting a...
+<!-- Check one of the following options with "x" -->
+- [ ] Regression (a behavior that used to work and stopped working in a new release)
+- [ ] Bug report  <!-- Please search GitHub for a similar issue or PR before submitting -->
+- [ ] Feature request
+
+## Current behavior
+<!-- Describe how the issue manifests. -->
+
+
+## Expected behavior
+<!-- Describe what the desired behavior would be. -->
+
+
+## [Minimal working example](https://en.wikipedia.org/wiki/Minimal_working_example) of the problem with instructions
+<!--
+For bug reports please provide a *MINIMAL DEMO* of the problem on https://codesandbox.io/ or in a separated github repository.
+BUG REPORTS NOT HAVING A REPRODUCTION WILL FROM NOW ON IMMEDIATELY BEING CLOSED!
+-->
+
+## What is the motivation / use case for changing the behavior?
+<!-- Describe the motivation or the concrete use case. -->
+
+
+## Environment
+
+<pre><code>
+ngx-mqtt version: X.Y.Z
+<!-- Check whether this is still an issue in the most recent ngx-mqtt version -->
+
+- Broker <!-- Hummingbird, HiveMQ, Mosquitto, etc. -->
+
+Others:
+<!-- Anything else relevant? -->
+</code></pre>