workflow: add a default template for Merge Request
Introduce a first basic template to try the feature.
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+++ b/.gitlab/merge_request_templates/Default.md Tue May 24 11:19:24 2022 +0200
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+---
+name: Official Review
+about: Submit a series for review
+---
+
+/assign_reviewer @mercurial.review
+
+Welcome to the Mercurial Merge Request creation process:
+
+* Set a simple title for your MR,
+* All important information should be contained in your changesets' content or description,
+* You can add some workflow-relevant information here (eg: when this depends on another MR),
+* If your changes are not ready for review yet, click `Start the title with Draft:` under the title.
+
+More details here:
+
+* https://www.mercurial-scm.org/wiki/ContributingChanges
+* https://www.mercurial-scm.org/wiki/Heptapod