Add a PR template to the repository

.github/PULL_REQUEST_TEMPLATE.md

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+## Fixes
+<!-- If PR doesn't fully resolve the issue, replace 'Fixes' below with 'Related to'. -->
+<!-- If there is no issue being resolved, please consider opening one before creating this pull request. -->
+Fixes #[issue number] by @[issue author]
+
+## Description
+<!-- Concisely describe what the pull request does. -->
+
+## Technical details
+<!-- Add any other information or technical details about the implementation; or delete this section entirely. -->
+
+## Tests
+<!-- Give steps for the reviewer to verify that this PR fixes the problem; or delete this section entirely. -->
+
+## Screenshots
+<!-- Add screenshots to show the problem and the solution; or delete this section entirely. -->
+
+## Checklist
+<!-- Replace  the [ ] with [x] to check the boxes. -->
+- [ ] My pull request has a descriptive title (not a vague title like `Update index.md`).
+- [ ] My pull request targets the *default* branch of the repository (`main` or `master`).
+- [ ] My commit messages follow [best practices][best_practices].
+- [ ] My code follows the established code style of the repository.
+- [ ] I added or updated tests for the changes I made (if applicable).
+- [ ] I added or updated documentation (if applicable).
+- [ ] I tried running the project locally and verified that there are no visible errors.
+
+[best_practices]:https://git-scm.com/book/en/v2/Distributed-Git-Contributing-to-a-Project#_commit_guidelines
+
+## Developer Certificate of Origin
+<!-- You must read and understand the following attestation. -->
+
+<details>
+<summary>Developer Certificate of Origin</summary>
+
+```
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
+```
+
+</details>