Add PR template to allow contributors to chose if reviews are recorded

Author: Byron

.github/pull_request_template.md

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+----
+
+Can [Byron](https://github.com/Byron) review the PR on video?
+
+Please choose one - no choice means no recordings are made.
+
+- [ ] Record review and upload on YouTube publicly
+- [ ] Record review and upload on YouTube, but keep video unlisted
+
+If you ticked any of the above boxes, I will always share a link to the video in the PR.