Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thanks for contributing to the Two-Factor plugin for WordPress! Filling out this template is required.  Any PR that does not include enough information to be reviewed may be closed at a maintainers' discretion.  All new code requires documentation and tests to ensure against regressions. -->
+
+## What?
+<!-- In a few words, what is the PR actually doing? -->
+
+## Why?
+<!-- Why is this PR necessary?  What problem is it solving? Reference any existing previous issue(s) or PR(s), but please add a short summary here, too. -->
+
+## How?
+<!-- How is your PR addressing the issue at hand?  What are the implementation details? -->
+
+## Testing Instructions
+<!-- Please provide steps on how to test or validate that the change in this PR works as described. -->
+
+## Screenshots or screencast
+<!-- if applicable -->
+
+## Changelog Entry
+<!--
+Please include a summary for this PR, noting whether this is something being Added / Changed / Deprecated / Removed / Fixed / or Security related.  You can replace the sample entries after this comment block with the single changelog entry line for this PR. -->
+> Added - New feature.
+> Changed - Existing functionality.
+> Deprecated - Soon-to-be removed feature.
+> Removed - Feature.
+> Fixed - Bug fix.
+> Security - Vulnerability.