Add PR/issue templates.

Make it easier for people to report issues.

Author: gerph

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something that's not right about the project
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Problem statement
+
+<!-- Explain what you think is wrong -->
+
+
+## Environment
+
+<!-- Give details about the environment in which you are running, for
+     example, the OS version, hardware, devices or applications that
+     are related to the issue -->
+
+
+## Expected result
+
+<!-- Explain what you expect to happen -->
+
+
+## Reproduction steps
+
+<!-- Explain how to reproduce, or which test the failure is in -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Is your feature request related to a problem?
+
+<!-- Give a clear description of what you're trying to address with
+     this request.
+     For example, "I'm always frustrated when [...]",
+     "It is hard to [...]"
+  -->
+
+## Describe the solution you'd like
+
+<!-- Give a clear description of how you the request might be
+     addressed. If you have ideas about how it could be implemented,
+     separate them from user interface changes.
+  -->
+
+## Additional context
+
+<!-- If you have some context, like places where this would have
+     helped, screenshots or mock ups of an interface, or the sort
+     of results you'd like to see, include them here.
+  -->

.github/pull_request_template.md

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+# Changes
+
+<!-- Describe the changes you've made in this section.
+     Try to explain why they're needed and what they do.
+     Your reviewers will use this to decide whether the
+     change is sufficient and correct.
+     You can include pictures or diagrams in here
+     (see mermaid documentation on GitHub).
+ -->
+
+# Testing
+
+<!-- Describe the testing you have done manually to
+     satisfy yourself that the change works as intended.
+     If automated tests have been updated, state this.
+     Include output or pictures if necessary.
+ -->

.gitlab/issue_templates/bug_report.md

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+## Problem statement
+
+<!-- Explain what you think is wrong -->
+
+
+## Environment
+
+<!-- Give details about the environment in which you are running, for
+     example, the OS version, hardware, devices or applications that
+     are related to the issue -->
+
+
+## Expected result
+
+<!-- Explain what you expect to happen -->
+
+
+## Reproduction steps
+
+<!-- Explain how to reproduce, or which test the failure is in -->

.gitlab/issue_templates/feature_request.md

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+## Problem statement
+
+<!-- Explain what you think is wrong -->
+
+
+## Environment
+
+<!-- Give details about the environment in which you are running, for
+     example, the OS version, hardware, devices or applications that
+     are related to the issue -->
+
+
+## Expected result
+
+<!-- Explain what you expect to happen -->
+
+
+## Reproduction steps
+
+<!-- Explain how to reproduce, or which test the failure is in -->

.gitlab/merge_request_templates/default.md

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+# Changes
+
+<!-- Describe the changes you've made in this section.
+     Try to explain why they're needed and what they do.
+     Your reviewers will use this to decide whether the
+     change is sufficient and correct.
+     You can include pictures or diagrams in here
+     (see mermaid documentation on GitHub).
+ -->
+
+%{first_multiline_commit_description}
+
+# Testing
+
+<!-- Describe the testing you have done manually to
+     satisfy yourself that the change works as intended.
+     If automated tests have been updated, state this.
+     Include output or pictures if necessary.
+ -->

CODEOWNERS

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+##
+# CODEOWNERS - define who is responsible for parts of the sources
+#
+# See:
+#   https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+#   https://docs.gitlab.com/user/project/codeowners/reference/
+#
+
+# Default code owners - automatically assigned for reviews
+* @gerph