Add PR template

.github/pull-request-template.md

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+# Documentation changes
+
+[Summary of documentation updates]
+
+# Review and preview
+
+Have you reviewed and previewed your documentation updates?
+In your local repository,
+1. Run `make spelling` and fix any spelling issues.
+2. Run `make linkcheck` and fix any broken links.
+3. Run `make run`. This will build a local copy of the entire documentation and you can preview the updated pages locally before creating this PR.
+
+## Reviewers
+
+Make sure to get at least one review from the [Anbox](https://github.com/orgs/canonical/teams/anbox) team.
+
+# JIRA / Launchpad bug
+
+[Add the associated JIRA ticket or Launchpad bug ID]