feat: Added issue templates.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug report] HERE IS YOUR CONCISE TITLE"
+labels: ''
+assignees: ''
+
+---
+
+**Basic information**
+Some required information from your use case.
+
+* Operating System: **Windows/macOS/Linux distro**
+* Calibre Version: **x.x.x**
+* Plugin Installation: **From Calibre/Rolling Release**
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature request] HERE IS YOUR CONCISE TITLE"
+labels: ''
+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.