Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report an issue with Chewy you've discovered.
+---
+
+*Be clear, concise and precise in your description of the problem.
+Open an issue with a descriptive title and a summary in grammatically correct,
+complete sentences.*
+
+*Use the template below when reporting bugs. Please, make sure that
+you're running the latest stable Chewy and that the problem you're reporting
+hasn't been reported (and potentially fixed) already.*
+
+*Before filing the ticket you should replace all text above the horizontal
+rule with your own words.*
+
+--------
+
+## Expected behavior
+
+Describe here how you expected Chewy to behave in this particular situation.
+
+## Actual behavior
+
+Describe here what actually happened.
+
+## Steps to reproduce the problem
+
+This is extremely important! Providing us with a reliable way to reproduce
+a problem will expedite its solution.
+
+## Version Information
+
+Share here essential version information such as:
+
+* Chewy version
+* Elasticsearch version
+* Ruby version
+* Rails version

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest new Chewy features or improvements to existing features.
+---
+
+## 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.