Added feature request template

Author: mnadareski

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,27 @@
+---
+name: Feature Request
+about: For when you know better than me what you want
+title: "[Request]"
+labels: enhancement
+assignees: mnadareski
+
+---
+
+**Before You Submit**
+- Remember to try the [latest WIP build](https://ci.appveyor.com/project/mnadareski/dicui/build/artifacts) to see if the feature already exists.
+- .NET Core 3.1 has known limitations, so make sure that what you're asking for isn't already in another build.
+- Check [previous issues](https://github.com/SabreTools/DICUI/issues) to see if any of those are related to what you're about to ask for.
+
+If none of those apply, then continue...
+
+**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.