[#27] Updating issue templates

[adamjstone]

Overview

This pull request addresses issue #27.

Here is an overview of the changes that were made.

1. Updated the feature request template.
2. Updated the defect report template.
3. Updated the pull request template.

Readiness checklist

This pull request is in compliance with the readiness requirements listed below.

• This pull request addresses one or more existing issues.
• Commit messages are simple and informative, and include references to an issue number.
• Applicable unit tests have been added or updated.
• All unit tests are passing.
• Thorough source documentation accompanies all code additions and modifications.
• Styling guidelines were followed.