#97: Add issue and pr templates (#98)

* Add issue template
* Add pull request 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?
+

.github/pull_request_template.md

@@ -0,0 +1,11 @@
+## #(issue number): Summarize your changes
+
+<!--Please include the reasons behind these changes and any relevant context.
+This project only accepts pull requests related to open issues -->
+<!--- Special phrase to auto-close the issue that your PR fixes -->
+Closes # (issue number)
+
+## Checklist before requesting a review
+
+- [ ] Have you followed the guidelines in [CONTRIBUTING.md](../CONTRIBUTING.md)?
+- [ ] Have you performed a self-review?