Checkin template for pull requests (#87)

Adds a template for pull requests.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,17 @@
+<!--  Thanks for sending a pull request!  Here are some tips for you:
+1. If you want *faster* PR reviews, read how: https://github.com/kubernetes/community/blob/master/contributors/devel/pull-requests.md#best-practices-for-faster-reviews
+-->
+
+**What this PR does / why we need it**:
+
+**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
+
+**Special notes for your reviewer**:
+
+**Release note**:
+<!--  Steps to write your release note:
+1. Use the release-note-* labels to set the release note state (if you have access)
+2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`.
+-->
+```release-note
+```