Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Report a bug
+about: Create a report about something that is not working properly
+labels: bug
+---
+
+### Describe the bug
+A clear and concise description of what the bug is.
+
+### To reproduce
+<!--
+We ❤ code! Ideally, please point us to a minimalistic repro project hosted in a GitHub repository.
+For a repro project, create a new project and apply the minimum required code to result in the issue you're observing.
+-->
+
+### Exceptions (if any)
+<!-- 
+Include the exception you get when facing this issue.
+-->
+
+### Further technical details
+- ASP.NET Core version.
+- Include the output of `dotnet --info`.
+- The IDE (VS / VS Code/ VS4Mac) you're running on, and its version.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Sponsor the project
+    url: https://github.com/sponsors/kevinchalet
+    about: In recognition of their support, sponsors can get private support and depending on the selected tier, an access to security announcements and patches
+  - name: Ask a question (community support)
+    url: https://stackoverflow.com/questions/ask?tags=openiddict
+    about: Ask a question that will be answered by the OpenIddict community

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Suggest an enhancement
+about: "Suggest an idea for this project. Note: priority will be given to suggestions made by sponsors"
+labels: enhancement
+---
+
+### Is your feature request related to a problem?
+A clear and concise description of what the problem is.
+Example: I am trying to do [...] but [...].
+
+### Describe the solution you'd like
+A clear and concise description of what you want to happen. Include any alternative solutions you've considered.
+
+### Additional context
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Ask a question or request support (sponsors-only)
+about: "Important: only sponsors can ask a question on GitHub. If you're not a sponsor, please post your question on StackOverflow"
+labels: question
+---