Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Relevant components**
+* [ ] Standalone tray application (based on Qt Widgets)
+* [ ] Plasmoid/applet for Plasma desktop
+* [ ] Dolphin integration
+* [ ] Integrated Syncthing instance ("libsyncthing")
+* [ ] Backend libraries
+
+**Environment and versions**
+* Versions of `syncthingtray`, `qtutilities` and `c++utilities`: …, …, …
+* Qt version: 5.….…
+* C++ compiler (name and version): …
+* C++ standard library (name and version): …
+* Operating system (name and version): …
+
+**Bug description**
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**
+1. …
+2. …
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature  request
+assignees: ''
+
+---
+
+**Relevant components**
+* [ ] Standalone tray application (based on Qt Widgets)
+* [ ] Plasmoid/applet for Plasma desktop
+* [ ] Dolphin integration
+* [ ] Integrated Syncthing instance ("libsyncthing")
+* [ ] Backend libraries
+
+**Is your feature request specific to a certain platform/environment? Please specify.**
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Eg. I'm always frustrated when […]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+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.