Create issue templates

Create issue templates for bug reports and feature requests.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve Unbound
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Thanks for taking the time to report an issue!
+
+Before continuing please make sure that you checked the existing (opened and closed) issues and pull requests to avoid opening a duplicate issue. We would rather prefer to add the information to the existing one. Feel free to reopen a closed issue if you think the issue is not resolved in your case.
+
+If you rather have a support question and you need guidance on running/configuring Unbound, please refrain from opening an issue and use the community support mailing list instead (https://www.nlnetlabs.nl/support/mailing-lists/).
+We would like to keep GitHub issues for possible bugs and feature requests only.
+
+If you are unsure whether an issue is a bug or not, feel free to reach out to mailing list users or open an issue here. 
+
+If you are opening an issue, please complete as much of the following sections as possible to give us a better understanding of your situation.
+-->
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior:
+1.
+2.
+3.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**System:**
+ - Unbound version:
+ - OS:
+ - `unbound -V` output:
+
+**Additional information**
+Add any other information that you may have gathered about the issue here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Unbound
+title: "[FR]"
+labels: ''
+assignees: ''
+
+---
+
+<!--
+Thanks for taking the time to report an issue!
+
+Before continuing please make sure that you checked the existing (opened and closed) issues and pull requests to avoid opening a duplicate issue. We would rather prefer to add the information to the existing one. Feel free to reopen a closed issue if you think the issue is not resolved in your case.
+
+If you rather have a support question and you need guidance on running/configuring Unbound, please refrain from opening an issue and use the community support mailing list instead (https://www.nlnetlabs.nl/support/mailing-lists/).
+We would like to keep GitHub issues for possible bugs and feature requests only.
+
+If you are unsure whether an issue is a bug or not, feel free to reach out to mailing list users or open an issue here. 
+
+If you are opening an issue, please complete as much of the following sections as possible to give us a better understanding of your situation.
+-->
+
+**Current behavior**
+Is there a current behavior that the feature relates to?
+If yes, would you wish the current behavior to change?
+
+**Describe the desired feature**
+A clear and concise description of what the feature should be.
+
+**Potential use-case**
+Describe how you see this feature being useful to other Unbound users.