[TASK] Add issue templates (#686)

Releases: main

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🔒️ Security Issue
+    url: https://typo3.org/community/teams/security
+    about: If you encounter a security issue 👿, please reach out **only** to the TYPO3 Security Team by writing to security (at) typo3.org. Please don't share the information with the Documentation Team or anyone else.
+  - name: ❓ Ask question
+    url: https://typo3.slack.com/app_redirect?channel=C028JEPJL
+    about: Please ask questions in the Slack channel "#typo3-documentation" 🤗

.github/ISSUE_TEMPLATE/issue_report.md

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+---
+name: 🐛 Issue Report
+about: If something is missing or not documented correctly 🤔
+
+---
+
+We recommend submitting changes and suggestions via pull requests. For small changes you
+can use the "Edit on GitHub" button which is found at the top of every documentation
+page.
+
+For more information on how you can contribute and help improve TYPO3's
+documentation, visit the "How to document guide": https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us/WritingDocsOfficial/Index.html
+
+### Current behavior
+
+A clear and concise description of what the problem is.
+
+### Expected behavior/output
+
+A clear and concise description of what you expect to happen.
+
+### Links
+
+One or more links to the documentation page (if available), preferably to the
+relevant section. If applicable, also link to other resources which might be
+helpful to better understand your proposal.
+
+### TYPO3 versions
+
+[e.g. 11, 12]
+
+### Possible Solution
+
+Only if you have concrete suggestions to solve the issue.
+
+### Additional context
+
+Add any other context or screenshots about your proposal here.