Add DCO info to PR template
Closes
@@ -5,7 +5,9 @@ Welcome to the Operator SDK! Before contributing, make sure to:
- Read the contributing guidelines https://github.com/operator-framework/operator-sdk/blob/master/CONTRIBUTING.MD
- Rebase your branch on the latest upstream master
- Link any relevant issues, PR's, or documentation
+- Check that the commit message is concice and helpful:
- When fixing an issue, add "Closes #<ISSUE_NUMBER>"
+ - Sign your commit https://github.com/apps/dco
- Follow the below checklist if making a user-facing change
-->
