Add pull-request template

Author: Mariana Sastre

.github/CODEOWNERS

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+# Tutorial:
+# https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# The PROTEUS Maintainer team will automatically be assigned to review each PR to main.
+* @FormingWorlds/proteus-maintainer

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: For when something is going wrong
+title: ''
+labels: 'Bug'
+assignees: ''
+
+---
+
+## Problem description
+A description of what is happening, and steps outlining what causes it to happen.
+
+## Expected behavior
+A description of what you would have expected to happen.
+
+## Evidence
+Add screenshots and logs to help explain your problem.
+
+## My computer
+Describe the computer used to run the code when the bug was found; e.g Fedora Linux with Python 3.12
+
+## Additional notes
+Add any other context about the problem here; e.g. suggest potential solutions
+
+## Relevant people
+Tag relevant people here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: For when something needs to be changed, added, or removed
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Feature description
+A short description of what you would like to be done; e.g. a new feature to be added.
+
+## Preferred solution
+Your suggested or preferred solution for implementing this feature or change.
+
+## Additional information
+Any other additional context; e.g. more details, related papers, other solutions.
+
+## Relevant people
+Tag people who should know about this request.

.github/PULL_REQUEST_TEMPLATE/pull_request.md

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+## Description
+A short summary of the changes made in this pull-request.
+
+Tag the [related issue](https://github.com/FormingWorlds/PROTEUS/issues); e.g. closes #xxx
+
+Include screenshots or log files if appropriate.
+
+## Validation of changes
+Describe what you did to verify that these changes address the tagged issue.
+
+Outline your test configuration; e.g. MacOS with Python 3.13.
+
+
+## Checklist
+
+- [ ] I have followed the [contributing guidelines](https://fwl-proteus.readthedocs.io/en/latest/CONTRIBUTING.html#how-do-i-contribute)
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my code
+- [ ] My changes generate no new warnings or errors
+- [ ] I have checked that the tests still pass on my computer
+- [ ] I have updated the docs, as appropriate
+- [ ] I have added tests for these changes, as appropriate
+- [ ] I have checked that all dependencies have been updated, as required
+
+## Relevant people
+Tag people who should know about this PR here