Add Pull Request Template

Add a pull request template.  Modeled after CRI-O (Thanks @saschagrunert!) and
Dockers.

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

Author: TomSweeneyRedHat

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,66 @@
+<!--
+Thanks for sending a pull request!
+
+Please make sure you've read and understood our contributing guidelines
+(https://github.com/containers/buildah/blob/master/CONTRIBUTING.md) as well as ensuring
+that all your commits are signed with `git commit -s`.
+-->
+
+#### What type of PR is this?
+
+<!--
+Please label this pull request according to what type of issue you are
+addressing, especially if this is a release targeted pull request.
+
+Uncomment only one `/kind <>` line, hit enter to put that in a new line, and
+remove leading whitespace from that line:
+-->
+
+> /kind api-change
+> /kind bug
+> /kind cleanup
+> /kind deprecation
+> /kind design
+> /kind documentation
+> /kind failing-test 
+> /kind feature
+> /kind flake
+> /kind other
+
+#### What this PR does / why we need it:
+
+#### How to verify it
+
+#### Which issue(s) this PR fixes:
+
+<!--
+Automatically closes linked issue when PR is merged.
+Uncomment the following comment block and include the issue
+number or None on one line.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`, or `None`.
+-->
+
+<!--
+Fixes #
+or
+None
+-->
+
+#### Special notes for your reviewer:
+
+#### Does this PR introduce a user-facing change?
+
+<!--
+If no, just write `None` in the release-note block below. If yes, a release note
+is required: Enter your extended release note in the block below. If the PR
+requires additional action from users switching to the new release, include the
+string "action required".
+
+For more information on release notes please follow the kubernetes model:
+https://git.k8s.io/community/contributors/guide/release-notes.md
+-->
+
+```release-note
+
+```
+