docs: add the PR template to the submodules too (#10)

* docs: add the PR template to the submodules too

* docs: PR template should also ask for related PRs

.github/pull_request_template.md

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+<!-- PR template: please provide enough information to guide your reviewers.
+Please read Contributing.md before submitting a PR.  -->
+
+### PR Goal? <!-- Explain the main objective of this PR. -->
+
+
+
+### Fixes? <!-- List any issues this PR fixes, e.g. Fixes #42, Fixes #324 -->
+
+
+
+### Feedback sought? <!-- What should reviewers focus on in particular? -->
+
+
+
+### Priority? <!-- How soon would you like this PR reviewed, does it block other work? -->
+
+
+
+### Tests added? <!-- Make sure your PR includes automated tests for your changes. -->
+
+
+
+### How to test? <!-- Explain how reviewers should test this PR. -->
+
+
+
+### Confidence? <!-- How confident are you that these changes are ready to merge? -->
+
+
+
+### Version change? <!-- Do you think this PR should trigger a Major (Breaking Change)/Minor (New Feature)/patch (refactor/bug fix) version change? -->
+
+
+
+### Related PRs? <!-- List PRs in other repos related to this PR, if any. -->
+
+
+
+<!-- Add any other relevant information here -->