Add both issue and pull request templates

Author: erran

.github/ISSUE_TEMPLATE.md

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+<!-- Remove any sections that do not apply to your problems. HTML comments are ignored. -->
+# Description
+<!-- Describe your problem here. -->
+<!-- Include references to relevant pull requests/commits here. -->
+
+## Expected behavior
+<!-- Describe your expected behavior here. -->
+
+## Observed behavior
+<!-- Describe your observed behavior here. -->
+
+## Steps to Reproduce
+<!-- Describe the steps to reproduce the observed behavior. -->
+<!-- Have a failing spec for this? :) -->
+
+# Stack Trace or Log Messages
+<!-- Use the following format for showing stack traces: -->
+<details>
+<summary>Stack trace for `brief error context`</summary>
+<pre>
+... Full error context (collapses by default) ...
+</pre>
+</details>

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Remove any sections that do not apply to your changes. HTML comments are ignored. -->
+# Description
+<!-- Describe your changes here. -->
+<!-- Include references to relevant pull requests/commits here. -->
+<!-- * Did you update documentation? -->
+<!-- * Did you update test coverage? -->
+
+# Motivation and Context
+<!-- Describe the use case that requires your changes. -->
+
+# Usage Examples
+<!-- Code or screenshot examples of using your feature, if applicable. -->
+
+# Testing Steps
+<!-- List any steps required to test your changes. -->
+
+# Post-merge Steps
+<!-- List any steps required after merging your changes. -->