Add PULL_REQUEST_TEMPLATE.md

Change-Id: Icb670c70d3afbf3b1476a5968ab8f3f910e0000f
Signed-off-by: David Enyeart <enyeart@us.ibm.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,47 @@
+<!--- DELETE MARKDOWN COMMENTS BEFORE SUBMITTING PULL REQUEST. -->
+
+<!--- Provide a descriptive summary of your changes in the Title above. -->
+
+#### Type of change
+
+<!--- What type of change? Pick one option and delete the others. -->
+
+- Bug fix
+- New feature
+- Improvement (improvement to code, performance, etc)
+- Test update
+- Documentation update
+
+#### Description
+
+<!--- Describe your changes in detail, including motivation. -->
+
+#### Additional details
+
+<!--- Additional implementation details or comments to reviewers. -->
+<!--- Summarize how the pull request was tested (if not obvious from commit). -->
+
+#### Related issues
+
+<!--- Include a link to any associated issues, e.g. Jira issue or approved rfc. -->
+
+<!---
+#### Release Note
+If change impacts current users, uncomment Release Note heading and provide
+release note text.
+Also, copy release note text into the release specific /release_notes file.
+-->
+
+<!--
+Checklist (DELETE AFTER READING):
+
+- `Signed-off-by` added to commits (required for DCO check to pass)
+- Tests have been added/updated (required for bug fixes and features)
+- Unit and/or integration tests pass locally
+- Run linters and checks locally using 'make checks'
+- If change requires documentation updates, make updates in pull request,
+  or open a separate issue and provide link
+- Squash commits into a single commit, unless a stack of commits is
+  intentional to assist reviewers or to preserve review comments.
+- For additional contribution guidelines see the project's CONTRIBUTING.md file
+-->