Create pull_request_template.md

Add a PR template warning of deprecation and that PRs won't result in CVEs.

Author: dmcyber

.github/pull_request_template.md

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+## Do Not submit PRs to this repo.
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+The CVE Program Git Hub Pilot is Deprecated as of 30 June 2023. 
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+
+Your PR will Not generate a CVE Record. 
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+Please see CVE.org for more info.