.github: Create pull_request_template.md

GitHub throws away the relevant information like having even a valid
email address for the person asking to pull.

Another common problem on GitHub, people don't do any of the simplest
things that the kernel people expect from a commit message, like:

 - No "short one-line description in the first line".
 - No sane word-wrap of the long description. GitHub commit messages
   tend to be (if they have any description at all) one long
   unreadable line.
 - No sign-off and other tags that we require for commit message.

Let's fix this by creating a pull request template that contains pull
request guidelines for GitHub Pull Request.

Link: https://github.com/axboe/liburing/pull/464#issuecomment-950950688
Signed-off-by: Ammar Faizi <ammarfaizi2@gmail.com>
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