Add Issue Templates with Auto Labeling

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create A Bug Report
+title: 'A concise title of what the bug is.'
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Use Image '...'
+2. Use Configuration '....'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Actual behavior**
+A clear and concise description of what actually happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment**
+(please complete the following information)
+ - OS: [e.g. Ubuntu 16.04, MacOS 10.13]
+ - Vips: [e.g. 8.8, 8.9, etc]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Enhancement or Feature Request
+about: Suggest an addition to libvips
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. 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.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a Question
+title: ''
+labels: 'question'
+assignees: ''
+
+---
+
+Ask a question...
+