Create feature_request.md

Author: tfSheol

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest new functionality for this project.
+title: ''
+labels: ''
+assignees: ''
+
+---
+By submitting an Issue to this repository, you agree to the terms within the [Code of Conduct](https://github.com/tfSheol/raspberry-pi-cluster-packer/blob/master/CODE-OF-CONDUCT.md).
+
+### Describe the problem you'd like to have solved
+
+> A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### Describe the ideal solution
+
+> A clear and concise description of what you want to happen.
+
+## Alternatives and current work-arounds
+
+> A clear and concise description of any alternatives you've considered or any work-arounds that are currently in place.
+
+### Additional context
+
+> Add any other context or screenshots about the feature request here.