Create ISSUE_TEMPLATE.md (Homebrew#46993)

.github/ISSUE_TEMPLATE/ISSUE_TEMPLATE.md

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+<!-- It’s extremely unlikely your issue isn’t covered by one the templates. Please go back and use one of them. If you still decide to open an issue without a template and we deem it was covered by one of them, your issue will be closed without comment or review. Repeat offences might get you banned. Those templates exist to help us help you. When you don’t use them, you’re making our work more difficult. Please respect our time. Thank you for your understanding. -->