Add a merge-request (pull-request, PR) template to communicate more on a PR.

Related: rhbz#2096347

.gitlab/merge_request_templates/default.md

@@ -0,0 +1,41 @@
+<!--
+Thanks for sending a pull-request!
+
+Please make sure you describe the context of the PR on the comment below.
+-->
+
+# Merge Request Required Information
+
+## Summary of Changes
+
+**Context of the pull-request:**
+<!--
+Please make sure you fully describe the context of the PR.
+-->
+
+
+**Pull-request or commit in Fedora Rawhide:**
+<!--
+Fedora is the upstream distro of the CentOS Stream. We follow the "upstream
+first", but there may be some exceptions.
+
+Please paste the upstream PR or commit URL here, if you have one.
+-->
+
+
+**Select priority:**
+<!-- Select one by [x] -->
+* [ ] urgent
+* [ ] high
+* [ ] medium
+* [ ] low
+* [ ] unspecified
+
+**Do you need someone's review?:**
+<!-- Select one by [x] -->
+* [x] Yes
+<!-- If you do not require a review, unmark Yes and mark No. You have to provide reasoning for this. -->
+* [ ] No, because:
+
+## Approved Bugzilla Ticket
+All submissions to CentOS Stream are required to have an approved [Red Hat Bugzilla](https://bugzilla.redhat.com/) ticket in a commit message, except only changing dot or yaml files. Please follow the CentOS Stream [contribution documentation](https://docs.centos.org/en-US/stream-contrib/quickstart/).