Add issue templates.

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Issue template for miscellaneous issues.
+title: "[OTHER]"
+labels: ''
+assignees: Alexhuszagh
+
+---
+
+## Prerequisites
+
+If applicable to the issue, here are a few things you should provide to help me understand the issue:
+
+- Qt version: [5, 6]
+- Extension: [Advanced Docking System, ...]
+- Theme: [Dark, Light, Dark-Purple, ...]
+
+## Description
+Please include a clear and concise description of the issue.
+
+## Additional Context
+Add any other context or screenshots about the issue here.

.github/ISSUE_TEMPLATE/documentation.md

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+---
+name: Documentation
+about: Request changes to the project's documentation.
+title: "[DOC]"
+labels: documentation
+assignees: Alexhuszagh
+
+---
+
+## Description
+Please include a clear and concise description of the issue.
+
+Ex: Build instructions sample for Qt6 C++ install using CMake in the README no longer works.
+Ex: Comments in `stylesheet.qss.in` contains a typo.
+
+## Additional Context
+Add any other context or screenshots about the issue here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project.
+title: "[FEATURE]"
+labels: enhancement
+assignees: Alexhuszagh
+
+---
+
+## Problem
+A clear and concise description of what the problem is. Please include screenshots of a Qt application using BreezeStyleSheets with arrows pointing to where the feature could be added, if applicable.
+
+## Solution
+A clear and concise description of what you want to happen.
+
+## Prerequisites
+
+If applicable to the feature request, please describe the theme, extension, or Qt version the feature should be added to.
+
+- Qt version: [5, 6]
+- Extension: [Advanced Docking System, ...]
+- Theme: [Dark, Light, Dark-Purple, ...]
+
+## Alternatives
+A clear and concise description of any alternative solutions or features 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: Question
+about: Have a question how to use BreezeStyleSheets?
+title: "[QUESTION]"
+labels: question
+assignees: Alexhuszagh
+
+---
+
+## Question
+A clear and concise description of what the question is. Ex. how do I add BreezeStyleSheets to a Qt6 C++ project using QMake?