Update issue templates

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Problem
+A clear and concise description of what the problem is. Tell us why we should be working on this. Ex. I'm always frustrated when [...]
+
+## Difficulty
+> Select one of the following and delete the other. Add any nuance below. How much time will we need to spend on this and how does that constrain the solution?
+
+**Tiny:* This is a project that one programmer or designr can do in a day.
+
+**Small:** This is a project that a team of one designer and one or two programmers can build in one or two weeks.
+
+**Big:** This project takes an entire team working for a full development cycle (six weeks).
+
+## Solution
+> A clear and concise description of what you want to happen. Drawings and doodles are very encouraged.
+
+## References
+Provide a list or overview of references and planning docs helpful in understanding the problem or solution.
+
+## Additional context
+Add any other context or screenshots about the feature request here.