Add issue template for "Request new formatter"

Author: dbarnett

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,9 +2,19 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: enhancement
+labels: ''
 assignees: ''
 
 ---
 
+**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.

.github/ISSUE_TEMPLATE/question.md

@@ -1,6 +1,6 @@
 ---
 name: Question
-about: Ask a general question
+about: Ask a general question about vim-codefmt
 title: ''
 labels: question
 assignees: ''

.github/ISSUE_TEMPLATE/request-new-formatter.md

@@ -0,0 +1,17 @@
+---
+name: Request new formatter
+about: Submit a request for a formatter not already supported (or requested at https://bit.ly/3alNxjb)
+title: ''
+labels: new formatter
+assignees: ''
+
+---
+
+**Formatter tool**
+[Name of the tool and link to context]
+
+**Filetype(s)**
+[Applicable languages/filetypes you'd like to use this tool to format]
+
+**Additional context**
+[Add any other context or screenshots about the feature request here.]