Add GitHub templates for issues and pull requests

Author: pushkyn

.github/ISSUE_TEMPLATE.md

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+#### Issue Summary
+
+A summary of the issue and the environment in which it occurs. If suitable, include the steps required to reproduce the bug. Please feel free to include screenshots, screencasts, code examples.
+
+
+#### Steps to Reproduce
+
+1. This is the first step
+2. This is the second step
+3. Further steps, etc.
+
+Any other information you want to share that is relevant to the issue being reported. Especially, why do you consider this to be a bug? What do you expect to happen instead?

.github/PULL_REQUEST_TEMPLATE.md

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+### Description
+
+<!-- Please describe what the changes are made in this pull request and why the change was necessary. -->
+
+<!--
+Please enter each Issue number you are resolving in your PR after one of the following words [Fixes, Closes, Resolves]. This will auto-link these issues and close them when this PR is merged!
+e.g.
+Fixes #1
+Closes #2
+-->
+### Fixes #