Add issue templates (#44)

Author: deliahu

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!--- Please fill out the sections, deleting any that are not applicable -->
+
+### Description
+
+[Description of the bug]
+
+### Application Configuration
+
+[If applicable, any relevant resource YAML configuration or the name of the example application]
+
+### To Reproduce
+
+[Minimal set of steps to reproduce the behavior]
+
+1. ...
+2. ...
+3. ...
+
+### Actual Behavior
+
+[Description of the actual behavior]
+
+### Expected Behavior
+
+[Description of the expected behavior]
+
+### Screenshots
+
+[If applicable, any screenshots that show the issue]
+
+### Stack Trace
+
+[If applicable, the stack trace which shows the error. Find it with `cortex logs <resource name>`, or use `kubectl get pods -n cortex` and use the name of the failed pod in `kubectl logs <pod name> -n cortex`]
+
+```
+<paste stack trace here>
+```
+
+### Version
+
+[e.g. `0.2.2` or `master` (find with `cortex --version`)]
+
+### Additional Context
+
+[If applicable, any other context about the problem]
+
+### Possible Solution / Implementation
+
+[Optional]

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Suggest a feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+### Description
+
+[A description of the feature]
+
+### Motivation
+
+[An explanation of how this will improve the product, what problem this will solve, and/or what the use case is]
+
+### Additional Context
+
+[Optional: Any relevant context, designs, notes, or resources]

.github/ISSUE_TEMPLATE/question.md

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