Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to report a problem
+title: ''
+labels: problem
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps or runnable code to reproduce the problem.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**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
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Please consider**
+- Could this feature benefit the many who use Pundit?
+- Could this feature be useful in _most_ projects that use Pundit?
+- Is this feature not Rails-specific?
+
+**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 how you'd like to approach solving the problem.
+
+**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. Ex. if you've solved this problem in your own projects already, how that worked, and why the feature should be moved and maintained in Pundit instead.