Add issue template

Author: nifadyev

.github/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,25 @@
+---
+name: Bug report
+about: Report a problem and provide necessary context
+title: 'Fix ...'
+labels: 'bug'
+
+---
+
+<!--
+Hi, thanks for submitting a bug. We appreciate that.
+
+But, we will need some information about what's wrong to help you.
+-->
+## What's wrong
+
+<!-- Describe what is not working. -->
+
+## How it should work?
+
+<!-- Describe how it should work. -->
+
+## Checklist before calling for maintainers
+
+* [ ] Have you checked to ensure there aren't other open [Issues](../issues) for the same problem?
+