Create issue_template.md

Author: Hopding

.github/issue_template.md

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+# 🚨⚠️ STOP!!! ⚠️🚨
+
+👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇
+
+**All new issues must be created from a template: https://github.com/Hopding/pdf-lib/issues/new/choose**
+
+👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆👆
+
+* If you create an issue without using a template it will be closed without comment.
+* Do not create an issue if you have a question. Open a [discussion](https://github.com/Hopding/pdf-lib/discussions/new) instead.
+* If none of the templates match what you're looking for, then you should not create an issue. Start a [discussion](https://github.com/Hopding/pdf-lib/discussions/new) instead.
+
+See [MAINTAINERSHIP.md#issues](https://github.com/Hopding/pdf-lib/blob/master/docs/MAINTAINERSHIP.md#issues) for more information.