Add GitHub issue templates

Part of #6.

.github/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/issue_documentation.md

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+---
+name: 'Issue: 📚 Documentation'
+about: 'You came across parts of the documentation that should be fixed'
+title: ''
+labels: documentation
+assignees: ''
+
+---
+
+<!--
+Thanks for reporting an issue in the documentation.
+
+Before opening a new issue, please make sure that we do not have any duplicates already open. You can ensure this by searching the issue list for this repository. If there is a duplicate, please close your issue and add a comment to the existing issue instead.
+-->
+
+## Where to find the issue
+<!-- Be as specific as possible by naming the document, page, and ideally paragraph. -->
+
+## Describe the issue
+<!-- Please let us know what exactly is the issue with that part of the documentation -->
+
+## Suggested change
+<!-- If you have ideas on how to fix this issue, please note them here, or consider creating a Pull Request -->

.github/ISSUE_TEMPLATE/issue_enhancement_request.md

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+---
+name: 'Issue: 🛠 Enhancement Request'
+about: 'You have an idea for an enhancement'
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+<!--
+Thanks for proposing an enhancement.
+
+Before opening a new issue, please make sure that we do not have any duplicates already open. You can ensure this by searching the issue list for this repository. If there is a duplicate, please close your issue and add a comment to the existing issue instead.
+-->
+
+## Current Implementation
+<!-- Describe or point to the current implementation that you would like to see improved -->
+
+## Suggested Enhancement
+<!-- Outline the idea of your enhancement, by e.g., describing the algorithm you propose. -->
+
+## Expected Benefits
+<!-- Summarize how your enhancement could aid the project (performance, readability, usability, etc.).  -->
+
+## Is this something you're interested in working on
+<!--- Yes or No -->

.github/ISSUE_TEMPLATE/issue_feature_request.md

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+---
+name: 'Issue: 🎁 Feature Request'
+about: 'You have an idea for a new feature'
+title: ''
+labels: new feature
+assignees: ''
+
+---
+
+<!--
+Thanks for requesting a feature.
+
+Before opening a new issue, please make sure that we do not have any duplicates already open. You can ensure this by searching the issue list for this repository. If there is a duplicate, please close your issue and add a comment to the existing issue instead.
+-->
+
+## Feature description
+<!---
+Provide a detailed description of the feature or improvement you are proposing. What specific solution would you like? What is the expected behaviour?
+
+Add any other context, screenshots, or code snippets about the feature request here as well.
+-->
+
+## Problem and motivation
+<!---
+Why is this change important to you? What is the problem this feature would solve? How would you use it?
+-->
+
+## Is this something you're interested in working on
+<!--- Yes or No -->

.github/ISSUE_TEMPLATE/issue_other.md

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+---
+name: 'Issue: 💬 Anything else?'
+about: 'You have some other issue to raise'
+title: ''
+labels: 
+assignees: ''
+
+---
+
+<!--
+Thanks for contributing to the project.
+
+Before opening a new issue, please make sure that we do not have any duplicates already open. You can ensure this by searching the issue list for this repository. If there is a duplicate, please close your issue and add a comment to the existing issue instead.
+-->
+
+* [ ] None of the other issue templates apply to this issue.