Add PULL_REQUEST_TEMPLATE.md
Add PULL_REQUEST_TEMPLATE.md

Signed-off-by: ialidzhikov <95faeb6d7aa694b503cab5034479812a90dec06c@gmail.com>

kubernetes/autoscaler,mmerrill3/autoscaler,mmerrill3/autoscaler,kubernetes/autoscaler,kubernetes/autoscaler,mmerrill3/autoscaler,mmerrill3/autoscaler,kubernetes/autoscaler